Ay, nakaka-stress talaga ito, but honestly 2.5 months pa lang kaya marami pang time for catch-up, babies grow in spurts, hindi consistent! May babies na mukhang smaller pero perfectly normal lang, while some talagang need extra monitoring. Best thing to do is huwag mag-compare sa babies ng iba; ang best measure ay ang weight gain niya month-to-month at kung active siya at kumakain well. Pero to be sure, I'd really recommend asking your pedia sa next checkup or kahit anytime kung concerned ka, they can plot her on the growth charts properly at makikita nila kung may need ng follow-up or all good lang talaga!