Ay mama, totoo yan, marami sa amin na-experience ito in the third trimester, it's so frustrating especially when you're already thinking about baby's weight! Usually it's because ng pressure sa stomach from how big baby is na, but hindi rin ito normal na mag-alala, better to check with your OB agad para ma-rule out kung walang iba pang concerns like gestational diabetes or other stuff, at sila rin may tips kung paano kumain ng maliit pero nutritious portions para baby pa rin kumakain well. In the meantime, try to eat small frequent meals instead ng big meals, at eat what you can tolerate, even if it's just crackers or milk, okay lang yun for now kasi yan nalang kaya ng katawan mo. Sending you strength mama, kaya mo yan, almost there na!