My son is 7 months. He hasn't started crawling yet, but he scoots pretty far. In the past week, he has really been moving in bed. He even fell out earlier this week(He is ok, no bruising or anything). So now when I put him down before I fall asleep, I make a fortress of pillows and obstacles, but he still gets pretty far. I really want to continue cosleeping but I'm really concerned. Pillows don't seem to be working and we have a king size bed so space shouldn't be an issue. What else can I use and will he move around this much all the time?