Adding Card to ListView

I figured it out, the whole problem was in using itemExtent: 25.0, at ListView.builder by removing it, everything became expandable by default and run smoothly.

While searching for the solution, I came across this and this and this, that helped me rebuilding the app in a cleaner code, below it is for who is interested:

main.dart:

import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';
import 'BabyModel.dart';
import 'BabyCard.dart';

void main() => runApp(MyApp(
  textInput: Text("Text Widget"),
));

class MyApp extends StatefulWidget {
  final Widget textInput;
  MyApp({this.textInput});

  @override
  State<StatefulWidget> createState() => MyAppState();
}

class MyAppState extends State<MyApp> {
  bool checkBoxValue = false;

  @override
  Widget build(BuildContext ctxt) {
    return StreamBuilder(
      stream: Firestore.instance.collection('baby').snapshots(),
      builder: (_, AsyncSnapshot<QuerySnapshot> snapshot) {
        var documents = snapshot.data?.documents ?? [];
        var baby =
        documents.map((snapshot) => BabyData.from(snapshot)).toList();
        return BabyPage(baby);
      },
    );
  }
}

class BabyPage extends StatefulWidget {
  final List<BabyData> allBaby;

  BabyPage(this.allBaby);

  @override
  State<StatefulWidget> createState() {
    return BabyPageState();
  }
}


class BabyPageState extends State<BabyPage> {
  @override
  Widget build(BuildContext context) {

  //  var filteredBaby = widget.allFish.where((BabyData data) {
  //    data.name = 'Dana';
  //  }).toList();

    return MaterialApp(
        home: SafeArea(
        child: Scaffold(
        body: Container(
        child: ListView.builder(
            itemCount: widget.allBaby.length,
            padding: const EdgeInsets.only(top: 10.0),
            itemBuilder: (context, index) {
              return BabyCard(widget.allBaby[index]);
            })
      ),
    )));
  }
}

BabyModel.dart:

import 'package:cloud_firestore/cloud_firestore.dart';

class BabyData {
  final DocumentReference reference;
  String name;
  int vote;

  BabyData.data(this.reference,
      [this.name,
        this.vote]) {
    // Set these rather than using the default value because Firebase returns
    // null if the value is not specified.
    this.name ??= 'Frank';
    this.vote ??= 7;
  }

  factory BabyData.from(DocumentSnapshot document) => BabyData.data(
      document.reference,
      document.data['name'],
      document.data['vote']);

  void save() {
    reference.setData(toMap());
  }

  Map<String, dynamic> toMap() {
    return {
      'name': name,
      'vote': vote,
    };
  }
}

BabyCard.dart:

import 'package:flutter/material.dart';
import 'BabyModel.dart';

class BabyCard extends StatefulWidget {
  final BabyData baby;

  BabyCard(this.baby);

  @override
  State<StatefulWidget> createState() {
    return BabyCardState(baby);
  }
}

class BabyCardState extends State<BabyCard> {
  BabyData baby;
  String renderUrl;

  BabyCardState(this.baby);

  Widget get babyCard {
    return
      new Card(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: <Widget>[
            ListTile(
              leading: const Icon(Icons.album),
              title: Text('The ${baby.name} is having:'),
              subtitle: Text('${baby.vote} Votes.'),
            ),
            new ButtonTheme.bar( // make buttons use the appropriate styles for cards
              child: new ButtonBar(
                children: <Widget>[
                  new FlatButton(
                    child: const Text('Thumb up'),
                    onPressed: () { /* ... */ },
                  ),
                  new FlatButton(
                    child: const Text('Thumb down'),
                    onPressed: () { /* ... */ },
                  )]))]));
  }

  @override
  Widget build(BuildContext context) {
    return new Container(
          child:  babyCard,
        );
  }
}

And the output is: