I used one too, my baby is 11 months now and she's fine. We co-sleep. But I just found out recently that we should not put anything that can endanger our babies during sleep and this includes pillows and blankets. Here's an article about it: https://parenting.firstcry.com/articles/when-to-use-pillow-for-baby/ I this it is up to you whether you use one or not. As long as you can ensure the safety of your baby.