Sleeping on the side 4 1/2 months

knottie4b85224c990697ad

Hello,
my baby girl is 4 1/2 months and she has been moving a lot at night. I noticed her sleeping in her side is this normal? Should I be concerned? She has been doing it the past week and I’ve gotten no sleep watching her not roll completely over. 

knottief3af26a7580da29d

My 4 1/2 year old has been sleeping on his side for a month now; nothing else works for him. I believe it is his preference, and I do not stress about it.

knottie1dc2f00de0542c71

Mine is the same age 4.5 mo and is doing this too. I’ve tried to gently turn baby onto his back once he’s asleep. Sometimes it works other times he wakes up.