Ay, 103 grams sa 4 months ay medyo mababa, mamsh, normal kasi ay around 120-150 grams na yan at this point, kaya better to ask your OB about it in your next checkup para sure lang. A few of us moms nag-worry din dito, and honestly the ultrasound measurements can vary, pero mas safe na marinig straight from your doctor kung ano talaga ang status ng baby mo. Keep taking your vitamins and eat well, at huwag mag-stress masyado dahil that also affects baby natin.