my baby is 4 months 28 days old and was exclusively breastfed. however, since last 20 days I started supplementing with formula as he seemed very hungry even after being breastfed (one feed at night). but since one week, baby seems interested in bottle and sometimes refuses breast. This I feel will further reduce my milk supply. how do I ensure that baby doesn't reject breastfeeding and milk supply is maintained till baby is one year of age?