My baby learnt to crawl at 6 months,and at 8 and a half months is still not able to sit. Every time I try and put him in a sitting position he either arches his back and then falls or loses his balance and goes forward and then crawls off. he is able to pull himself to standing easily, and can sit back on his heels to get down from standingg. Going in a high chair is difficult.
Seems strange, anyone experienced the same thing or have tips to help his sitting. Because he is so mobile putting in a ring etc is fruitless as he just climbs off.