we switched to cows milk at 11 months as my DD refused formula and would only drink cows.

i asked my MCHN and said dont water it down, just straight and as long as she isnt vomiting or getting runny poo or consitpated then stick to it

she was on 3 bottles a day still till 16 months then she self weaned off the lunch bottle.

so id say hold off for a month or so.