My 6 week old baby is paired with his dad, who is over 6 months. After pairing him with dad, I stopped feeding alfalfa pellets because dad is too old to have them. I haven't been supplementing with high calcium foods or hay either, for the same reason. But I just read an old post that said that babies under 6 month still need some high calcium foods. Is this true, and if yes, what kind and how much?