My 2.5 month baby boy has been on breastfeeding plus bottle milk since day 1 (as my breast milk is not sufficient). He has formula feed of about 60-80 ml every 2-3 hours). Suddenly since 2-3 days, he is not accepting bottle. He cries when bottle is taken near him and refuses to suck. He is accepting breastfeeding, but not bottle. What should I do?