Use it on my son when he was about a month old when I noticed a flat spot on the left side of the back of his head. It helped round his head and he seemed comfortable sleeping on it. It probably worked in combination with tummy time. During the day I gave him a lot of tummy time. Now he is 3.5 months old and still sleeps on it. I am very happy with it. If there is one downside to this pillow, it's its odd shape. Doesn't match the baby pillowcases I bought for him.
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