Can I just say I was in your position while PG with DS. The Drs were pushing me for a CS for the same reasons (DD was 8lb 13oz) they said subsequent babies are usually bigger & boys are generally bigger than girls (my second was a boy). I also had a 3rd degree tear with DD.

I chose another vag birth. DS was born at 39+2weeks PG & only weighed 7lb 3oz & I only tore a tiny amount. (DD was 41+1weeks)

Thats just my experience. FWIW I will always choose Vag over cs in the future. If I need an emergency cs then such is life, but I'll try vag first.

Good luck with your pending birth