The Heart to Heart insert is designed to properly support a newborn in the Ergo. As baby grows the outer shell of the insert can be separated from the base of the insert this makes it more useable longer and continues to offer support to baby. I do agree it is a thick item and can be very warm. For summer I would think about a Wrapsody Baby Bali stretch wrap (like Moby) it is more supportive longer than a Moby and lighter weight for more comfort to you and baby.
1/5/12 at 10:05am