What is the best way to unlatch my baby?

Break the seal! Gently press your finger between the baby's mouth and your nipple and push down on your breast to create a break in the seal - the vacuum - that the baby's suckling is creating. Once the seal on their little oral vacuum is broken, they'll come right off!
Use your finger. Put your finger in between your nipple and his mouth, pressing your breast away to break the seal.