Ah sis, common yan! A few of us mums noticed parang antok talaga especially by evening pag may iron sa vitamins, pero depende rin sa body mo, some of my friends didn't feel it at all. Try taking it with food pa (which you're doing na with breakfast, good!) and maybe tignan mo if the afternoon drowsiness gets better after a week or two, kasi sometimes our bodies just need to adjust sa new supplement. If it keeps happening or nakakadisrupt sa araw-araw mo, better mention it sa pedia ni baby next visit so makita niya if kailangan swap ng brand or adjust the timing.