Mom 2 Michael

We are getting ready to sail on the Harmony of the Seas on Sept 15th. My 3 year old will be sailing with us. I would like to know if there are height restrictions for the slides in Splashaway Bay and the Aqua Park. My son is 38" and potty trained. Will he be granted access in both Splashaway Bay and the Kids Aqua Park? I read on a recent blog that he would need to wear a swim diaper even if he is potty trained. Is this true? Are the height restrictions enforced? I would greatly appreciate any insight. Thank you in advance!