Not sure what to do

Wa

This is my baby Louka. He was born 4 weeks early. He has always seem to be a bit behind what other babies his age are doing. He can roll everywhere. He gets in the position to crawl but won't. He has got on his knees lots of times like he wants to stand. I'll hold him so he can stand up. He will put weight on his legs and feet. Then, it seems he gets scared and let's go. He does not like his walker. He cried when we put him in it. Idk what I should do to get him to start standing and walking. He will be a year old on January 7th.

My first son was standing by 7 months and walking within a few weeks of standing.