All babies ( rug rats) now or then don’t wanna sleep. They want to play, or want attention. Don’t give in. Let em whine. Don’t waste your money talking to a pediatrician. There gonna dish out some sleep training advice. KISS.. Keep it simple stupid works now and then. Try altering nap schedules and feeding times. Establish new bedtime routines. And stick with them. Otherwise the rug rat will be getting over on you instead you over on them. Get some dark shades for the room. Maybe try a white noise machine. Some rock and roll. If nothing works check your mattress. If its not organic the baby is breathing in chemicals. Throw the chemical mattress out and get an organic one. Pass it on the the next rug rat. You wont be sorry.