So, my baby has severe IUGR (Intrauterine growth restriction) caused by issues with the placenta and weighed 4lbs at full term. Because of his low birth weight, on advice of his doctors we have had to feed him at least every two hours which often required waking him to feed. He is 5 months old now and although still below the 0.4th centile he is doing better weight-wise so we no longer have to keep such a strict schedule and can let him sleep for longer periods. However, I'm finding it hard to get past the worry of him sleeping too long (and therefore missing feeds) and I often read on here 'never wake a sleeping baby' (sometimes prefaced with 'unless low weight' etc). Its got me wondering why these exact words are often used. Is it because if the baby is sleeping it gives you a chance to sleep/get on with stuff/have a break? Or is there another more medical/ developmental reason? If my baby is having a long nap in the daytime should I truly not wake him and let him have as much sleep as he wants or does there come a point when you think 'ok, enough now' and wake to feed them?