From Longman Dictionary of Contemporary Englishchildproofchild‧proof /ˈtʃaɪldpruːf/ adjective something that is childproof is designed to prevent a child from opening, damaging, or breaking it a childproof lock
Examples from the Corpus
childproof• The padded fabric varieties are well and truly childproof - and look very attractive.• a childproof aspirin bottle• Where possible, only buy bleaches, disinfectants and floor cleaners that are fitted with childproof caps.• The cap had a childproof seal, and it was proving to be pretty Lucasproof as well. 