Ay, ganyan din si baby ko around that age, medyo slow ang weight gain kaya nag-worry din kami! Six and a half kilos at 4 months is on the lighter side talaga, kaya best na i-check with your pedia to make sure baby's getting enough milk and ruling out any issues like tongue tie or latch problems. A few of us sa group namin noticed na kung mahina ang suck, kailangan ng proper positioning or sometimes need ng lactation consultant, game changer yun for us! Basta don't stress too much pa, pero do get it checked soon para sigurado lang.