I used these for my newborn. They are size 50-60. I've washed them as best as I could, but some have slight yellowing around the neck from milk. They have been home-laundered. See photos. The red heart ones have particularly stubborn yellowing around the neck, but I'm including them as a bonus since you'll need plenty of changes. These were purchased at Nishimatsuya. I don't know where the animal ones came from, as they were a gift.