My baby is 5 months 13 days old.. she was only on bm till 4 months.. at month 5 started fm milk and also bm. I am giving only three to four times Fm and rest of the time bm. it's been one month I am noticing that she is not drinking Fm more than 90 ml.. now it's her 6th month but the quantity she drinks is only 90 ml / one feed.. is that enough for her? why her appetite is less?