I can not get my 2 and half month old son to sleep at night?

Each child is different. He'll sleep through the night when he is ready to.

Each kid is different. Its NOT easy to get on a schedule and things definitely get much worse before they get better when trying to start a schedule. It can take 2 months to get everything working in sync. Keep trying and wake that baby up during the day or at least from 3 p.m. on to change the sleeping schedule.

Try putting him on a 3-hour schedule during the day. Feed him, keep him up for an hour and a half or two hours, let him sleep an hour, then do it again. If you will consistently do that, he will soon be sleeping through the night.

Haha, consider yourself LUCKY with your daughter! Babies do not typically sleep through the night that early. It stinks but it's part of parenting. They need food, and diaper changes, and love. Ask your hubby (or bf) to wake up a couple nights so you don't have to. Sleep when baby sleeps during the day. Give it time and don't push.

Make sure you are not equating "perfect baby" with "quiet and convenient". This is the BIGGEST mistake I think we can make as parents, and sadly, our culture feeds these misconceptions that children are supposed to be born sleeping like adults and behaving themselves all the time. Sleep is as unique as the child...and can take years for them to "sleep through the night". Some children do with little coaching, others need to be "trained" against what is perhaps good for them to do so, and in those cases, there can be the high cost of trust in you and security.
Follow his cues...they are so little for such a short time! Soon, it will be over and you'll have scheduled and timed and trained your child instead of enjoying her and learning the wonderful zen lesson they can teach us.

This is normal! Good luck!

He's still an infant. This is normal. I think the one who was out of the ordinary was your daughter! Try keeping him awake more during the day (its hard, I know). At bedtime, make sure it's dark and quiet. Also, try to keep it dark and quiet during the time you would like him to nap during the day. I don't know if this is something you'd consider, but cosleeping is what got ME sleep.

http://www.babyslumber.com/happiestbaby.html

This helped us.

umm you jst got REALLY lucky the first time around. At that age it is very normal for babies not to sleep through the night yet. mY DD is almost 10 months..STILL doesnt sleep through the night!! Try getting your son on a routine and it will help him sleep most of the night..but usually not all the way through