My 18 month old started head butting his cot- fast and repeatedly when he was about 12 months. we had to transfer him into his travel cot as he often bruised himself and I have to admit I found the noise quite distressing. He has since changed his behaviour to leaning up against the travel cot mesh and repeatedly throwing himself back onto it. It's like an extreme form of rocking. weird.
Has anyone else experienced this or similar? What happened? Any advice or opinions?