This product is in stock. The delivery time is 1-2 work days
The "Booster" extension pack with booster seat and removable headrest is perfect for carrying an infant and could be used in combination with the PhysioCarrier. But it is also designed for a bigger baby, who gets a higher perch and a much better view over your shoulder.
When the baby weighs a lot, the booster is useful to give the carrying adult a higher center of gravity and the sensation of carrying a backpack (which some people prefer).