I have a question specifically about the infant inserts for this carrier. The product description says to only use them in the “front carry position”. What does this mean? I’m reading it as you can only use it on one f the two babies (the one you carry in front) this rendering it useless as a twin carrier for babies that little. Or is it referring to the actual position of the baby and you can carry 2 infants at once? I know that the carrier itself carries 2 babies, but I am specifically referring to the infant inserts and that product description about front carry. Thank you!!