C.R.
My boys did this to, I finally figured out that it was because the bed was cold when I laid them down. You have to remember that all that body heat from holding them is gone when you lay them down. We fixed this putting a blanket from the dryer down before you lay them down. This might only work if you have someone there to get the blanket out of the dryer for you. We also had an electric blanket that I would turn on and lay on the bed between the sheets. When I would lay them down I would just pull the electric blanket out before laying them down. The other thing that would work sometimes was to put a blanket on me before they would climb up into my lap. The body heat warms the blanket,when you get up just wrap the blanket around the child and keep the blanket on them when you lay her down. Make sure that the blanket will lay under her head as well as her body when laying her down. God Bless and Good Luck!