DS was waking every 2-3 hours during night for breast-feed from birth. From around 4months he would go down at 7pm then wake around 10-11, then around 2am then every hour till 7 or 8 (when I'd get up). this was driving me insane. DP persuaded me to move to formula feed at night which I did and DS now sleeps 7pm - 3or4am then untill around 7am. This is obviously a massive improvement but should he be sleeping right through by now? He is 6months next week and will be starting solid food. My DD sleeps from 7pm to 8 or 9am and has done since around 6months.