Laying to sitting

Ashley

My LO will be 1 yr old next week. He belly crawls, can pull up to kneeling and then to standing. Can sit un-assisted. Cruises on occasion. However…. He can not go from laying to sitting on his own yet. Sometimes even when he is sitting when playing with toys he will lose his balance and fall backwards. Should I be concerned that he isn’t hitting this milestone? Did you experience the same thing? What helped?