Responsive feeding means letting your baby's cues, rather than the clock, tell you when to feed. You watch for early signs of hunger like rooting, stirring or bringing hands to the mouth, feed in response, and let the baby stop when they are full.
It is the approach usually recommended for young babies. Feeding to cues supports milk supply when breastfeeding and helps babies learn to regulate how much they take, which is easier on their appetite than a fixed timetable.
With twins, following two sets of cues independently can leave you feeding nonstop. Most twin parents feed responsively but add a light touch of synchronising, offering the second baby a feed when the first shows hunger, so both stay fed and roughly in step.