I remember it well. It was 12 weeks. I even noted it in dd's baby book. And when she did not wake up I did not wake her up to eat because I didn't want to create that habit.

I read that they need to be at least 11 lbs. before their little stomachs can make it through the night.

Are you bottle-feeding? They can go longer without eating.

It will get better. 5 hours is not horrible for that age.

How is everything else going?

P.S. Our dd sleeps 11 hours straight now. Make sure you don't have your dd fall asleep in your arms. We did, and had to break her of that habit with CIO and it was really hard.