Older babies, beyond the newborn stage, can maintain your breastmilk supply alongside formula feeding as long as you breastfeed several times a day. Much older babies – from eight or nine months – can breastfeed just a handful of times a day, and there is still a supply.
Very well-established breastfeeding, with a baby who is one year or older, can continue with as few as one or two feeds in 24 hours. If your baby is over six months they can use a beaker or cup rather than a bottle.