Is my baby behind?

My baby will turn 6 months old in 2 weeks and she's sitting up by herself with no help for about 5 seconds until she falls over. She also rolls over to her side but not rolling over from tummy to back or vise versa... is she behind? She kicks her back leg while on her stomach but she doesn't know how to... show more My baby will turn 6 months old in 2 weeks and she's sitting up by herself with no help for about 5 seconds until she falls over. She also rolls over to her side but not rolling over from tummy to back or vise versa... is she behind? She kicks her back leg while on her stomach but she doesn't know how to roll her stomach over.. and she's not quite sitting up for too long without falling over but she can sit up from 5-10 seconds by her before falling over
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