Hi ladies I have a nine month old son who is b...

Hi ladies I have a nine month old son who is breastfed and eats three solid meals a day. He happily takes the three meals. But is there any way to know if bub is getting enough breastmilk? Is there a guide for this age? (I should note I don't have the facilities to express). I'm just a little worried because he seems to be a bit fussier at the breast and they are feeling a little fuller than usual. Thanks for your help!