My son is 10.5 months old. Feb 19, 2018 is his birth date. He is not crawling or sitting by his own. When we make him sit, he sit. When we make him hold the chair, he walks by moving it. But he is not able to get up by his own from lying position. I am very much worried abt this. Consulted pediatrician but he says some children will take 1.5 years to walk. But I am not convinced. Please let me know if this is something to be seriously looked upon or it is normal for some babies and he will start to get up by his own in some days