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Not so easy when you are in a hospital recovering from birth. They generally won't allow things from offsight into the hospital either, so even if you (dad) goes to get some you have to get it in without getting caught.

The other side is nursing is hard, and so it is easy to cheat and use formula when you could with a little effort nurse the baby just fine. (Nursing is generally slightly better for the baby, but the difference is tiny. Nursing is generally a lot better for the wallet though)