About 80 percent of mothers in the US Breast Feed at birth according to the CDC.

Here is a linked article written by a pediatrician that answers a bit of the question you are alluding to: why are moms not giving babies more "traditional" care

https://www.nbcnews.com/think/opinion/baby-formula-shortage-mothers-breastfeeding-blamed-rcna28595

In case you don't want to read the article, the problem seems to be when moms can't breastfeed, or don't make enough milk.

If you look in the US at how fast moms have to go back to work, and how little post natal care we receive, you will perhaps understand a little about why women have to supplement with formula.

80 percent of US mothers breastfeed at birth

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