A calm resort house reef (see our diving & snorkelling guide) is about as forgiving an environment as exists for a child's first snorkelling experience — shallow, warm, and generally far calmer than open ocean or beach-break conditions elsewhere in the world.
Start with mask comfort, not the reef
A well-fitted mask that doesn't leak is the single biggest factor in whether a child enjoys or dislikes snorkelling — more important than the fins or even the location. It's worth spending time getting a proper fit before ever getting in the water, and letting a child practise breathing through a snorkel in shallow water or even a pool first.
Use flotation without hesitation
Life jackets or snorkel vests are widely available at resorts and remove a huge amount of the anxiety (for both child and parent) that can otherwise overshadow a first attempt — there's no downside to using one, even for a confident young swimmer.
Pick calm conditions and a short first session
A short, calm first session that ends on a high note works far better than pushing for a long swim — see our best time to visit guide for how conditions vary by season, and ask resort staff which specific part of the house reef is calmest and most beginner-friendly.
What to actually look for together
Reef fish (see our turtles & everyday marine life guide) are usually enough to hold a child's attention on a first outing — there's no need to chase a whale shark or manta encounter for a first snorkel to feel exciting.