Hay, congrats sa 26 weeks! 904 grams is actually on the lighter side para sa ganyang gestation, so I'd really suggest bringing this up with your OB sa next check-up kasi they can do proper measurements and see kung lahat ay okay lang talaga. A few of my preggy friends had similar concerns and mas nabigyan sila ng peace of mind once na nag-usap sila ng malinaw with their doctor about growth charts and what to expect next, it's honestly the best way to know for sure!