My baby is 3.5 months old. In first two months she was taking breast milk as well as formula milk sometimes in a day . But from last few days she is not taking formula milk neither from bottle nor from spoon. Breast milk is enough but sometimes i would not be able to feed her , like when i have some important work at home ir day to day household work or need to go out for an hour or two. At market place or some other place one can not feed with breast milk all the time .Please advise.