suddenly since last 3-4 days my 2n half old baby is not sleeping properly. he used to sleep for 2-3 hrs immediately after bath but now it takes effort to make him sleep n den also he sleeps only for 1-2 hrs n even he doesn't sleep at night. he sleeps by around 2.30-3 n woke up at 9.30-10. what could be the reason n wht i can do to increase his sleeping hrs.