M.,
Wow, he must have been a deep sleeper to last that long in the wedge...my children were only able to use it for a month and it scared me to death not to use it so young. My 3 month old immediately flips onto her tummy when we lay her down, but I was told if they can do this on their own...that they are fine. As far as blankets, I did with my son, but since my daughter has been born, we opted to just put her in a really warm sleeper, and now I don't worry about her covering her face up. They never stay covered up anyway and I figure when she is about a year, she'll be fine with a blanket. Hope this helps, A.