Hello doctor, my baby is 4.5 months old not rolling at all even she only goes to left side when shes angry or excited but not complete roll. Sometimes once in 5 6 times shes does roll from tummy to back but thats all other milestons Laughing smiling cooing all day. kicks objects which come to her reach conterates on every moving objects try to get hold of objects that interest her goes ahead while on tummy by pushing hard surface with legs plays with my finger wants to stand all day long and tries to get up on her own Is it normal for her to not roll. i m worried