So far my two are different.

DD- ate so well and slept through the night at 7 weeks. But then around 5 months started waking.we ended up taking her in a lot and doing cio at 9 months and it worked but it took about a week.

Ds is a terrible eater and didnt sleep through the nightuntil 17 weeks. But once he started i have never had any problems. He sleeps 11 hours and doesnt wake up at all. I did cio with him at 4 months but it only took 2 nights. He was also waking and coming in with us and that had to stop.

So are your two alike or totaly different in every way