According to the pictures, they look fine in terms of weight. Like several others have mentioned, goats DO need copper. Depending on which part of the country you live in they sometimes need extra copper supplements and selenium supplementation too. A good goat mineral should be able to help balance what they need. Just follow the directions on the bag if you opt for loose minerals and there are also specially designed goat mineral blocks available at most feed supply places.
As for the hay, I would suggest splitting up the hay they need to feed half in the AM and other half in the PM. It will keep them more content, and I also second the no grain needed, unless they loose body conditioning.
Dairy goats usually need a richer hay that is higher in protein, and Nigerians, non-breeding/milking mini Nubians, and wethers can generally get by with a lower protein hay. I have several different breeds of goats and my Nigerians and mini Nubians can gain weight just by smelling grain!
Do educate yourself about the worming needs in your area and the best wormers to use. Internal parasites are usually the goats biggest enemy.
They are both very adorable!