Is bub actually drinking a lot or comfort sucking?
I only weaned DS a few months ago (he is almost 3!) but his was definitely comfort feeding.
So I slowly weaned one at a time every few days and replaced with pats/cuddles.
If bub is drinking lots try feeding more solids as suggested or it could juat be a growth spurt too. I'd still suggest just dropping one at a time to see how you go.