DD is 14 months and I was wondering how many naps she needs. She gets one for sure everyday but sometimes depending on how early or late she wakes up, she does not get a second one. The problem is that by the time it's bedtime she is having meltdowns that I know are caused by being overly tired from not napping. Should I try to get her into more predictable sleeping and nap times? Or should I just let her show me when she's tired?