Hello Kate,
You don’t necessarily need to get a degree in or related to child life to be one! You just need to have 10 courses relating to it which, being that you’re a graduate student for LPC you might have the required courses already done. The following link provides more information — http://childlife.org/files/CL%20Course%20Verification%20Form%20-%20FINAL.pdf
& thank you for the feedback! 🙂