9 months old need help

[kendal6]

My son is now 9 months old he's the youngest out of my 3 children
He was born premature by 6 weeks and I had a lot of complications with his pregnancy
He's now 9 months old but
Can't sit unadided
Can't laugh or giggle
And my biggest problem is he's still being fed every 3 hours
I've spoke to doctors and health visitors and get the same line "hell do it in his own time"
He won't swallow solid food or mushed food
I've tried jars packets u name it I've tried it and he's still on baby milk stage 2 for hugry babies
He won't sleep through at night he's up every 3 hours

Someone please give me some advice I'm one tired mummy

My daughter was 10 weeks early. She flatly refused baby food or anything of a spoon so did baby led weaning and at 14 month she is only just eating of a spoon. As for the sitting unaided I don't think she did it till 11 month. It's only now at 14month she crawls properly and stood up for the first time last week. Have you asked about phisio for him? I know how worrying it is but he will catch up eventually he might just need a little help

We got referred to a speech therapist for DD's pushing out of food. I would push for some help if i were you.

Dd is 8 months actual.