He has had the same bedtime routine since 10 weeks (bath, bottle, book, cuddle) but since Monday has started getting upset when we put him down and leave. This happens at both naptime and bedtime. We've stuck to our routine and he has cried for about 5 mins before going to sleep. He sleeps through from about 7.30 to 6.30. Is this normal behaviour at his age? Any advice about how to handle it? During the day he is happy, affectionate, lively and chatty.