Bm and fm both. Some alternate ideas.

A healthy baby usually feeds every 2-3hourly. When the baby is adequately fed the baby will remain playful and sleep quietly for the next 2-3 hours after a feed. If you feel the need to breast feed earlier than that, especially at a 10 min interval that suggests that possibly the last feed was inadequate. At this stage rather than abrubtly shifting from mixed feeding to exclusive breast feeding it would be better if you make the transition gradually while assessing if after every feeding he remains playful for the next 2-3 hours. If not so then you can supplement with formula. Gradually you can change over to exclusive breast feeding. If supposing you find that the baby has fallen asleep while breast feeding then gently stroke the soles of the baby, gently touch the ears, interact with the baby during the process of feeding or partially remove the nipples, this way the baby will wake up again and start sucking.