I used to do foster care and my first placement was a baby who was 6mths and in newborn clothing and obviously malnourished, when you held him he was stiff in your arms as he was not used to being held, he would cry to be put back down, the back of his head was severely flattened from constantly laying on his back. The poor thing was terrified and was hyper-vigilant. My first purchase was a baby sling and I wore him everywhere and had to let him realise that touch was comforting it didn't take long for him to thrive.