Ay, alam ko yan, ganyan talaga ang phase na yan! At 4 months, maraming babies suddenly reject the bottle kasi mas prefer nila ang comfort ng breastfeeding, especially kung laging available ang mama. The thing is, bottle aversion sa ganitong edad is pretty common pero kailangan ma-address para hindi magiging issue later pag kailangan mo talaga mag-away. Try offering the bottle when baby is calm (not too hungry, not fussy), let someone else give it, use a different bottle or teat shape kung kailangan, at maybe warm the milk para mas close sa breastfeeding experience, pero if persist pa rin or may other concerns, worth checking with your pedia kasi baka may other reason. Galingan mo lang sa patience; eventually mareresolve yan with consistency!