Good nightsleeper won't nap during day!!

[stewarty]

My 16 wk old ds sleeps 10-12hrs at night ,Hurrah!!But is obviousely tired during the day but will only nap in car,out in pram or being cuddled,any advice on how to establish naps in cot during day.Becomes very grumpy when tired (as does his mummy)

dd started waking at 5.30am but taking this into account tried putting to sleep in cot early at 8am - 10 mins l8r she was asleep and slept for 40 mins I had to cuddle almost to sleep but worth it, anything better than screaming until 1040 and then being shattered for the rest of the day. I hope everyone has very good luck and hopefully it can only get better, well until she starts teething, weaning, rolling etc