Okay yan ay pretty normal pa for 16 months, sis! Most of the toddlers namin around that age ay ganyan na ang pattern, one solid nap lang at early bedtime, tapos ayaw na ng maraming naps, kaya ang gising nila umabot ng 6am. One of my mum friends swears na once sila nag-adjust sa isang consistent nap, natulog na ng mahimbing ang baby nila at mas okay na ang mood throughout the day. The 10-12pm nap ay okay lang, pero kung nakikita mo na siya ay getting enough sleep overall (around 12-14 hours daily including nighttime), then he's probably doing just fine, mommy!