The Red Castle Cocoonababy® nest seems quite small to me. I don’t really think my child will be able to use it for four months, what is the recommended age?

If you have a big baby, when he gets to 4 months old he may be longer than the nest – but this is not a problem. Simply remove the wedge and allow your baby’s legs to rest on the bottom edge of the nest with his feet over the end.  What is important is that at all times baby must not be able to push against anything with his feet and put himself into a hyper-extended posture.