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reactjs - How to change the default value in react native dropdown picker?

I want to change the value of React native dropdown picker: below is an image of my dropdown picker enter image description here

I want to display only the name as the value, and list remains the same style, for eg: value selected displays as 2year as here if the first item is selected

My complete code is as follows:

 import React, {useEffect, useState} from 'react';
    import {ActivityIndicator, TouchableWithoutFeedback} from 'react-native';
    
    import {SafeAreaView, View, Image, TouchableOpacity, Text} from 'react-native';
    import MaterialCommunityIcons from 'react-native-vector-icons/MaterialCommunityIcons';
    import MaterialIcon from 'react-native-vector-icons/MaterialIcons';
    import FontAwesomeIcon from 'react-native-vector-icons/FontAwesome';
    // bottom tab
    import {createBottomTabNavigator} from '@react-navigation/bottom-tabs';
    import Icon from 'react-native-vector-icons/FontAwesome';
    import DropDownPicker from 'react-native-dropdown-picker';
    //tabs component
    import HomeTabScreen from './HomeTabScreen';
    import ConsultationHomeScreen from '../Consult/ConsultationHomeScreen';
    import PlansTabScreen from './PlansTabScreen';
    import ChatTabScreen from './ChatTabScreen';
    import {useSelector, useDispatch} from 'react-redux';
    import {
      setSelectedChild,
      setSelectedChildId,
    } from '../../store/actions/userActions';
    import {isValidObject} from '../../utils/baseUtils';
    import {getChildFromUserChildrenList} from '../../utils/userUtils';
    import {setAppReload} from '../../store/actions/HomeActions';
    let controller;
    export default function PLHomeScreen(props) {
      const {navigation} = props;
      const [loading, setLoading] = useState(false);
    
      const Tab = createBottomTabNavigator();
      //child related
      const [loadApi, setLoadApi] = useState(true);
    
      //Use for all the dispatch actions
      const dispatch = useDispatch();
    
      const User = useSelector((state) => state.userReducer.user);
      const mSChildId = useSelector((state) => state.userReducer.selectedChildId);
      let mChild = getChildFromUserChildrenList(User, mSChildId);
      const defaultchildvalue = getChildFromUserChildrenList(User, mSChildId);
      console.log('default child',defaultchildvalue.name);
      const reloadApp = useSelector(
        (state) => state.premiumCardActionTypesReducer.reloadApp,
      );
    
      console.log('!!!! Reload App !!!!', reloadApp);
    
      useEffect(() => {
        if (!isValidObject(mChild)) {
          if (!isValidObject(mSChildId)) {
            let cid = User.children[0].id;
            handleChangeChild(cid);
          }
        }
        if (loadApi == true) {
          setLoadApi(false);
          setLoading(false);
        }
        if (reloadApp == true) {
          setLoadApi(true);
          setLoading(true);
          dispatch(setAppReload(false));
        }
        console.log('!!!! Reload App !!!!', reloadApp);
      }, [User, mSChildId, loadApi, reloadApp]);
    
      const handleChangeChild = (id) => {
        dispatch(setSelectedChildId(id));
        mChild = getChildFromUserChildrenList(User, id);
        setLoadApi(true);
        setLoading(true);
      };
    
      return (
        <TouchableWithoutFeedback onPress={() => controller.close()}>
          <SafeAreaView
            style={{
              flex: 1,
              alignItems: 'stretch',
              justifyContent: 'center',
              backgroundColor: '#FE017E',
            }}>
            <View>
              <View
                style={{
                  height: 56,
                  backgroundColor: '#FE017E',
                  alignItems: 'center',
                  flexDirection: 'row',
                  justifyContent: 'space-between',
                }}>
                <TouchableOpacity
                  onPress={() => navigation.openDrawer()}
                  style={{
                    backgroundColor: '#FE017E',
                    width: '100%',
                    height: 40,
                    padding: 10,
                  }}
                  underlayColor="transparent">
                  <Icon
                    size={20}
                    name="bars"
                    style={{marginLeft: 2}}
                    color="#fff"
                  />
                </TouchableOpacity>
              </View>
              {User != null &&
                User.children != undefined &&
                User.children != null &&
                User.children.length > 0 &&
                mChild &&
                mChild != undefined &&
                mChild != null && (
                  <DropDownPicker
                    controller={(instance) => (controller = instance)}
                    items={User.children.map((item) => {
                      return {
                        label: item.name + '
' + item.dob_text,
                        value: item,
                        icon: () =>
                          item.pic_url ? (
                            <Image
                              source={{
                                uri: item.pic_url,
                              }}
                              style={{height: 30, width: 30, borderRadius: 15}}
                            />
                          ) : item.gender === 'male' ? (
                            <Image
                              source={{
                                uri:
                                  'https://cdn3.iconfinder.com/data/icons/materia-human/24/013_042_newborn_infant_child_baby-512.png',
                              }}
                              style={{height: 30, width: 30}}
                            />
                          ) : (
                            <Image
                              source={{
                                uri:
                                  'https://cdn3.iconfinder.com/data/icons/materia-human/24/013_042_newborn_infant_child_baby-512.png',
                              }}
                              style={{height: 30, width: 30}}
                            />
                          ),
                      };
                    })}
                    onChangeItem={(item) => {
                      if (item.value.id != mSChildId) {
                        handleChangeChild(item.value.id);
                      }
                      controller.close();
                    }}
                    containerStyle={{
                      marginLeft: 60,
                      marginTop: -46,
                      marginBottom: 10,
                      height: 40,
                    }}
                    defaultValue={defaultchildvalue}
                    dropDownStyle={{
                      backgroundColor: '#ffffff',
                      marginLeft: 40,
                      borderColor: 'grey',
                      borderWidth: 1,
                      borderBottomEndRadius: 0,
                      borderBottomLeftRadius: 0,
                      borderBottomStartRadius: 0,
                      borderBottomRightRadius: 0,
                      minWidth: 100,
                      maxWidth: 150,
                    }}
                    itemStyle={{
                      justifyContent: 'flex-start',
                      fontWeight: 'bold',
                      fontSize: 20,
                      borderColor: '#FE017E',
                    }}
                    style={{
                      backgroundColor: '#FE017E',
                      borderBottomEndRadius: 0,
                      borderBottomLeftRadius: 0,
                      borderBottomRightRadius: 0,
                      borderBottomStartRadius: 0,
                      borderTopEndRadius: 0,
                      borderTopLeftRadius: 0,
                      borderRadius: 0,
                      borderColor: '#FE017E',
                      minWidth: 100,
                      maxWidth: 150,
                    }}
                    labelStyle={{
                      marginLeft: 15,
                      fontWeight: 'bold',
                      fontSize: 10,
                      color: 'black',
                      textAlign: 'center',
                    }}
                    arrowColor={'white'}
                    activeLabelStyle={{color: '#FE017E'}}
                    selectedLabelStyle={{color: 'white'}}
                  />
                )}
            </View>
    
            {loading ? (
              <ActivityIndicator
                color="#FF1493"
                size="large"
                style={{
                  backgroundColor: 'white',
                  justifyContent: 'center',
                  alignItems: 'center',
                  flex: 1,
                  flexDirection: 'row',
                }}
              />
            ) : (
              // <View>
              <Tab.Navigator
                lazy={true}
                initialRouteName="Home"
                tabBar={(props) => <MyTabBar {...props} />}>
                <Tab.Screen name="Home" component={HomeTabScreen} />
                <Tab.Screen
                  name="Consult"
                  component={ConsultationHomeScreen}
                  initialParams={{
                    mSChildId: mSChildId,
                  }}
                />
                {mChild != null && mChild.is_sc_subscribed == true ? (
                  <Tab.Screen name="Chat" component={ChatTabScreen} />
                ) : (
                  <Tab.Screen name="Plans" component={PlansTabScreen} />
                )}
              </Tab.Navigator>
            )}
          </SafeAreaView>
        </TouchableWithoutFeedback>
      );
    }
    
    // Tab navigator props
    
    function MyTabBar({state, descriptors, navigation}) {
      return (
        <View style={{flexDirection: 'row'}}>
          {state.routes.map((route, index) => {
            const {options} = descriptors[route.key];
            console.log('options', route);
            const label =
              options.tabBarLabel !== undefined
                ? options.tabBarLabel
                : options.title !== undefined
                ? options.title
                : route.name;
    
            const isFocused = state.index === index;
    
            const onPress = () => {
              controller.close();
              const event = navigation.emit({
                type: 'tabPress',
                target: route.key,
              });
    
              if (!isFocused && !event.defaultPrevented) {
                navigation.navigate(route.name);
              }
            };
    
            const onLongPress = () => {
              navigation.emit({
                type: 'tabLongPress',
                target: route.key,
              });
            };
    
            return (
              <TouchableOpacity
                accessibilityRole="button"
                accessibilityState={isFocused ? {selected: true} : {}}
                accessibilityLabel={options.tabBarAccessibilityLabel}
                testID={

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