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Recommended for 4 to 8 months. Begin the transition period just before your baby is able to roll over by themselves, or when their natural startle reflex has diminished.
You should choose the correct size Swaddle UP or Swaddle UP 50/50 based on their current weight, not their age or their length.
In the Swaddle UP range there are four sizes available: X Small (suitable for 2 - 3.2kg), Small (suitable for 3 - 6kg), Medium (suitable for 6 - 8.5kg), & Large (suitable for 8.5 - 11kg).
In the Swaddle UP 50/50 range there are three sizes available: Medium (suitable for 6 - 8.5kg), Large (suitable for 8.5 - 11kg), & X Large (suitable for 11 - 14kg).