Aw mama, I can feel your worry! So based sa check-up, high lactose ang issue kaya the low-lactose formula switch makes sense, Nestogen is a good choice na maraming moms namin ang nagamit din. Since the poop looks okay na ngayong umaga after the formula change, that's actually a good sign, pero I'd really suggest calling your pedia ulit once they're back from holiday, especially since the 3-day window might be up na and you want to make sure baby's settling well sa bagong gatas. Don't stress too much, this is super common at marami from our community na nakaranas ng similar lactose issues, and they bounced back fine once the formula was adjusted!