Monnie, has it really been 4 weeks already? I'm wondering, does Felix like being cradled in your arms? Or does he have reflux? I ask because Jack was a strong baby able to hold his head up from birth too (actually Tom was too, but he liked being cradled!), and he hated being cradled. He never liked the sling until he was about 2 months and I sat him in it. I just didn't put him in it until I was happy that he could go in with his head out. With just one child it wasn't so bad as he liked the pram, but thank goodness Tom loved the sling from day 1, made life much easier. I hope he takes to it soon for you.