I have a Bee and love it, however I am wondering at what age/size you can adjust the backrest from the lowest/almost lying flat position? Have run searches to find out the answer with no luck. My son is almost 4 months old and just over 14lb, still in the Baby Nest, we'll be getting the Foot Muff in the next 6-8 weeks I think, as it's getting snug when he's in a pramsuit. I'm not sure if you can tilt it up to the next position in the Baby Nest? He's getting interested in things a *lot* more and I think he'd love to sit up a little.