I'd think growth spurt, TBH. Try giving porridge at bedtime. That really fills up anyone's tummy and helps for a longer sleep. Or BF before solids are offered.

If he's feeding back to sleep, I'd let him feed. It was only when DS stopped feeding back to sleep that I stopped feeding at night (I'd drift off while feeding then he'd wake me up again to settle him another way... I was more tired that way!).