The PhysioCarrier or HoodieCarrier with the optional booster seat can be used from birth. This means that you can use this as your only baby carrier.
However, it is true that for the first few months we recommend a sling. Indeed it allows more skin to skin, helps with thermal regulation, lactation and attachment.
The Little Wrap Without A Knot is ideal in the "off-center belly" position. It is also recommended for use in neonatal wards.