My daughter rolled from tummy to back being just shy of 3 months and would do it every time while on tummy. The past 3 weeks, she won’t roll over (she’s 4 months) Is this normal? Will it cause delays in starting to become more mobile? She just refuses and has always hated tummy time. She cries and cries when we do it, I still try to get it in throughout the day, little bits at a time but never enough for her to realize she can’t crawl or to strengthen her neck. She can hold it up but I see pictures and videos of other children around her age starting to crawl, grab toys while on tummy ect