Hayley, as you were quite thin pre pregnancy then fully expect to put on those extra kgs. You will put on weight for yourself first and then the baby.

I did the same, esp with my first bub. I weighed 50kgs and am 5'7, so I was thin too. I gained 22 kgs with him. I lost that by the time he was 2 weeks old !! Second bub I gained another 22 kgs. This time it took me a few more months to loose it. Come bub no 3. I weighed more pre preg so I gained alot less. That time I only gained 14kgs. Again I lost it within 2 weeks after my c section. Bub 4, the magical 22kgs again. Not sure what it is with that number ( i know I am right though, checked my hosp cards) I did weigh less pre preg 4 than I did pre no 3. So again I think that's why I gained the extra. Took me a while to loose it that time. And of course once it was gone I fell preg again.
I am 26 weeks now and have put on 13 kgs already. I just know I will hit that 22kg mark again.

I don't stress about it though. I will loose it afterwards. Thankfully I have been lucky in loosing my baby weight. Still I would love to be one of those preg mums that only grows a bump and nothing else goes enormous too.

Good on you for wanting to set a good example for you bubba too. You owe it to the both of you to eat well and stay healthy