Hi Kristie one of the best ways to improve your supply is express
You should express after each feed - on both breasts even if its only for 5 mintues.
The other thing you can try is offering him both sides and then going back to the first side again. This will also increase your supply without having to express
Some other things to think about, drink lots of water, have a glass each time before you feed, eat well, get lots of sleep (as much as you can with a little man!!) and take care of yourself..hope this is helpful.
How old is he? Was the MCHN worried about how much he put on?
Jacquie, Mummy to Bailey, Tijana & Kaitlyn