hi baby rolled over from back to tummy on completing 2 months, but she is going to be 4 months, still not rolled over from tummy to back...is it a problem

A. Some succeed, but most take another month or two. By 4 months , many babies can roll from their stomachs to their backs. At 6 months, many babies begin rolling from their backs to their stomachs. If a baby cannot roll in either direction by 6 months, it may indicate a developmental delay or underlying health issue.