Feeding

BabyGirl • First time for me and my hubby to become mommy and daddy !!! I cant wait
This has been going on for almost a week but everything I go to feed my son he decides that's it's playing time and he will drink a little but and then split it out and act like he doesn't want it so then I would put him down and then he will start crying for food . it's tireding and annoying idk what to do ? I called his pediatrician and all he said is that as long as he is eating it's fine . I don't know if it's stress on him why he's doing this . I need answers please