why do some formula feeding moms not give baby colostrum?

Alex • Blessed to be mom to our miracle IUGR baby boy! I've never met someone as strong and brave as he is!
Not trying to judge at all. I'm completely pro-choice as far as the feeding debate is concerned... you do you. But I am honestly confused as to why some formula feeding moms won't even give their baby the colostrum for the first few days, then go to formula? 

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