That sunblock container is actually designed to hide your stuff. Its not really for sunblock, and real sunblock bottles usually can't be opened. Otherwise these are decent tricks.
When you go to the beach, use a clean diaper to wrap your wallet and keys in, and roll it up beside your towel. People will assume the diaper is garbage and won't touch it.
And you can take everything he has on his person.
yeah, because human kids have like, only 30 centimeters high