We used a swing with second daughter to help her sleep. She developed a bit of a flat spot and was advised regarding helmets to "fix" the flat spot. Thought that was overboard so decided against it. She's 3.5 now and perfectly normal. Babies are resilient. Do what's necessary to get by during this challenging period and don't pay too much attention to different recommendations, etc. Use common sense, give baby lots of love/affection and everything will be fine.