6 month old stopped drinking milk

[Anitaatje33]

Hi mummies, looking for any tips anyone experienced the same?
Fornula fed 6 month old daughter was never a great drinker (600ml per 24h max) but has now completely stopped drinking milk during the day. No matter how often we offer she wont have it. We tried different bottles, sippy cups, open cups, different milk. Even stopped the purees she is having twice a day (which she loves) to see if she would be more hungry for milk but no. She also
wont have water with her purees for extra hydration. Anyone recognises this? She is often constipated because of the low fluid intake. GP and HV are not worried as she doesnt show any other symptoms of dehydration. Today she has gone 16 hours so far without wanting milk. I know we should trust our little ones to tell us what they need and dont need, but this just worries me.

Would she eat something milky like baby porridge or baby cereal instead?

I used to nanny for a little boy who often suffered from constipation. I gave him prune juice mixed 50:50 with water. It was actually quite tasty (for some reason I imagined it wouldn't be) so he took it easily. I'd start with 50ml of the juice then go from there as it's quite effective and she's so small. The boy I looked after was 14 months when I started and had about 150-200ml a day plus the same amount of water.