I am medium sized with a large bust. The chest straps seem very tight in the front or back carry position. What can I do?

First, make sure the shoulder straps and chest strap are loose enough for the comfort of your baby and yourself, but not so loose as to compromise the integrity of the carrier. Then try wearing the chest strap higher on your chest. If neither of these solutions work, it is possible to wear the chest strap under your bust line. Be aware that the shoulder straps can slide off of your shoulders much easier in this position than they could if the chest strap were at your chest.