Some links on this page may be affiliate links. If you buy through them we may earn a small commission, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. How this works.

The quick answer

Keep it simple: send invites two to three weeks ahead, hang green streamers as seaweed, make jelly 'rock pools' with gummy fish, and play magnetic fishing and 'sharks and fish'. Party bags: a mini ocean sticker book, a small sea creature and a shell chocolate.

Under the sea is one of the easiest party themes to pull off at home, and it looks amazing with very little effort. Here's the plan we'd follow for a room full of excited four year olds.

Invitations

Send them two to three weeks ahead. Editable ocean invites you can personalise, then print or send by message, save a lot of faff.

Decorations

Food

Games four year olds love

Party bags

A mini ocean sticker book, a small sea creature figure and a shell-shaped chocolate. Done.

1
Best party game

Djeco Magnetic Fishing Game - Ocean

A classic that works for a whole group, and it's still good on rainy days afterwards.
Have a look →
Verity's verdict
Verity hasn't tried this lot yet. Her honest verdict goes here once she has, good or bad.

Questions parents ask

When should I send under the sea party invites?

Two to three weeks ahead. Editable invites you can print or send by message save a lot of faff.

What games work for 4 year olds?

Magnetic fishing, 'sharks and fish' (musical statues where the shark catches anyone still moving) and a shell treasure hunt.

What food fits an under the sea party?

Goldfish crackers, cucumber 'seaweed' sticks, jelly 'rock pools' with gummy fish and a wave-iced cake with toy sea creatures on top.