I've not had a baby post op but Ive had two before. Here's my experience .....
With my first, I gained so much weight. Got up to 346 from 280. Had high blood pressure, was extremely swollen from head to toe, and had to have him early via csection.
Second baby tried to eat healthy to prevent prior complications. Was doing fine until 37 weeks my blood pressure sky rocketed and I got back up to 318. I had to have an emergency csection again!
Being obese and pregnant is high risk. I had my sleeve 7 weeks after my last child was born. I know age is a factor too so honestly, I don't know what the best decision is. I'd talk to both surgeon and obgyn to see what's best for you.
Good luck!