Here are some answers to frequently asked questions:
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My kids wear 11" from birth to 1 year old, then 12" works well for 1yo-3yo, and 13" from 3+. You want it to allow for growth but not reach in the mouth while in the crawling position. Size is so relative, it is hard to guess! I like to recommend measuring with a string a comfortable necklace length and then measure the string.
I love the safety tension clasp for babies. They are designed to pop undone if pulled real hard, that gives piece of mind. I recommend the safety clasp for baby jewelry and mommy necklaces, but sometimes with older babies they make a game of pulling their jewelry off. Some people feel more comfortable doubling around the ankle while sleeping.
Can they get wet?:
Yes. We wear ours 24/7. I recommend washing it really well every once in a while. Built-up body oils make the beads start to appear polished. Remove the build up with dish soap, warm water and a toothbrush. It strips the oils off and makes the beads as good as new!