Crab Crawling baby

At first, it didn't bother mommy and mommy hasn't really give some attention of how he crawls until mommy asked mommy's personal trainer who's also physiotheraphy whether it's normal for baby having asymmetrical crawling
She said it's not normal though but it's not serious, it can be fixed just in case there's something wrong with hip bone or tight muscles and she advised me to ask pediatrician for confirming.

Then, mommy searched the answers in the internet, there are a lot of info regarding this. Some lead to cerebal pasy and autism. Some said that it's normal, they are different style of crawling as long as it showed new positive development in his gross motoric skill then it should be alright

So, mommy has peace of mind for now, 'cos everything looks normal for him when he stands, he put the body weight to both legs too.