DD2 didn't puke at all but the acid was coming up and she was swallowing it down again and of course it was hurting her so she was just crying all the time. She was diagnosed by my excellent GP and put on meds and it really helped. She was on the meds for over 18 months though as it didn't go away until then. It probably wouldn't hurt to have Lexie checked out by your GP for silent reflux. My DD1 was the all time puker lol projectile puke after every feed