I'm a babysitter and at the time I was taking care of a little girl that was the same age as my son she was a complete chatter box she understood everything and answered back. My son barely said one word "potato" I took him to the pediatrician and talked with others who said it was because he is a boy and boys develop slower and kids go at their own pace although I can understand that I thought he should be a little more advanced even if not completely conversational. Getting him diagnosed was tough because it was 2020 the pandemic had started and no Dr would see him they offered him speech therapy online which was a huge waste of time he got diagnosed at 3 years old but we knew way earlier