The Party Idea Playbook
Illustration of first birthday party

First birthday party

BirthdayAll agesMid costEasy effortIndoorAny gender

A relaxed first birthday with a smash cake, a milestone photo display and a sensory play corner.

Guests
10-30 guests
Party length
2 hours
Prep time
Half a day
Ages
1 (and guests of all ages)

What it could look like

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AI-generated example of a first birthday party
An example of how a first birthday party could look on the day. This image was generated by AI.

What it is

A first birthday is more for the grown-ups, but the star is the baby. Keep it short and around nap time, with a smash cake for the classic photos, a play corner for babies and good food for adults.

Plan ahead

  • Three weeks before: pick a time that fits the baby’s routine (often after a morning nap).
  • Two weeks before: print a photo from each month of the first year for a “12 months” banner.
  • The day before: bake or order a small smash cake (6 inches is plenty) and a main cake.

Set the scene

A “ONE” balloon, the monthly photo banner, a decorated high chair and a soft play mat area. Keep decorations out of baby’s reach.

Activities

Time capsule

Guests write a message to be opened on the child’s 18th birthday. Add the day’s newspaper and a photo.

Smash cake

Strip the baby to a nappy or a cake-smash outfit, put them on a wipe-clean mat, and let them dig in. Have a warm bath ready afterwards.

Sensory play

Soft blocks, a small ball pit, crinkle books and musical toys for the babies and toddlers.

Food and drink

  • Grazing platters, sandwiches and dips for adults
  • Soft finger foods for little ones: banana, steamed veg, rice cakes
  • Tea, coffee and fizz

Tips

  • Use a simple sponge with a light cream frosting for the smash cake; avoid nuts, honey and very sugary icing for babies.
  • Keep it to two hours - a tired one-year-old is not a party guest.

On the day

  1. Arrival (20 min): guests write a note for the baby's time capsule or a wish card.
  2. Food and mingling (30 min).
  3. Sensory play corner (open throughout): soft blocks, a ball pit and board books for the babies.
  4. Smash cake (15 min): baby gets their own small cake to explore while everyone takes photos.
  5. Main cake and Happy Birthday (10 min).
  6. Presents (optional) and goodbyes.

Shopping list

first birthday decorations
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smash cake topper
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baby ball pit
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one year milestone banner
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baby high chair banner
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first birthday outfit
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Party types

Birthdays by age

Who it's for

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