Hi mama! Honestly, mas importante muna na kumain ka ng masarap at balanced meals habang nagbreastfeed kasi yan talaga ang key sa pati weight gain mo and sa supply mo, a few of us tried the fancy vitamins pero parang ang real game-changer talaga was just eating more frequently, especially protein-rich foods like eggs, fish, and chicken. For baby's weight gain at 4 months, best talaga na i-check with your pedia kung okay na ang growth niya and kung may vitamin supplements na kailangan, pero usually breastmilk lang is enough if you're eating well din! Alam mo naman, sa atin kaya ang malaking bahagi ay nutrition lang talaga, not necessarily vitamins. Let me know kung ano sinabi ng doctor mo!