I agree. Our first little fella didn't sleep a whole night (what I call sleeping through) until he was 3 and half years old. Number two, our little princess managed it a bit earlier at around two years old and number three,at ten months,is still up twice a night.
Technically the sleep experts say that sleeping for a five hour stretch is classed as 'sleeping through'. Though for me five hours is nowhere near 'sleeping through'.
Because we live in the hectic 21st century we expect our babies to sleep through from a very early age. However, babies are not programmed this way and it is quite normal for babies to continue to wake up in the night until they are much older. We as parents are often put under pressure to get our little ones to sleep through and we are deemed to be failures if we don't.
A final thought, one of the reasons that breastfed babies have a reduced risk of SIDS is because they wake often in the night to be fed. So next time you feel under pressure from someone to get your baby to sleep through or you're awake feeding your little one, console yourself with the thought that them waking up may be keeping them alive.