My little Ethan is BF but i have started to wea...

My little Ethan is BF but i have started to wean him as i need to go back to work in a few months im finding that 1 feed each day he is getting a bit of wind stuck in his bowel and i need to feed him to get it to pass He doesnt have any trouble burping etc and he has a bottle at night and at lunch and its the lunchtime one that gets him!!! i just need him to pass that *fart* after the lunch feed is there anything i can give him i hate seeing my poor little lamb in pain thank god its only once a day Thanks Marie