First child was The Perfect Baby (wish I knew it back then, I would have appreciated it more) and slept through from about 4 or 5 months and has been the epitome of the perfect sleeper ever since. First time she slept through ... OMG ... I had engorgement from hell. Snatched her up the instant she woke up to relieve it.

Second one is a truly horrid sleeper and started sleeping through the night only after I stopped breastfeeding at 14 months and she had her sippy cup of water in with her at night. Mind you at 14 months we were lucky to get her into bed before midnight, usually well after. She still quite regularly refuses to sleep, the complaining from her room gets to us and so she ends up with us at 11pm watching TV in her PJs until we can convince her that bed really is a valid option for little girls. We spent the ENTIRE of her first year sleep-deprived.