at how many months do babies start to sit up? my sweet child ia 5 months and she is sitting up on her own.

thank you your little sure is a little beauty!! shes got gorgeous eyes
awww our babies are so close in age my baby girl will be 6mnts on march 14th. @mommyx415

oh god🙈
and I'm sitting strait up!
When will my baby start sitting up ?? He'll be 5 months on Friday .
At how many months do babies start to sit up on there own ? ☺️
Is it normal that my 5 month old is not sitting up by himself 😟 he sits up when the sofa is holding him up or when we're holding him that's it
When my son was a baby he started sitting up around 4 months and crawling at 6 months.
My cousins baby is 6 months and he isn't sitting up or pulling himself into a sitting position and I've noticed a lot of babies are sitting on their own by now.
Question: should my cousin be concerned with his development? Is he really behind in his development?