Trouble has hit now, I think my 4 1/2 month old is now starting to refuse the bottle when I am not available. He never had a problem taking it before when I pumped and left him one, however now, it's a different story. For whatever reason, he hasn't taken it from anyone, and just fusses till I get there. Then he acts as if he is starving. Any suggestions how to get him back interested in it. The bottles that I am using are the playtex nursers (same as before) 1st stage nipple.