Kindly help me wqith this sentence

[new2grammar]

My 1st take:

Protein is essential for the baby’s muscle development. Breastmilk is an incredible foodstuff for at least first six months.


My 2nd take:

Breast milk is an incredible foodstuff for baby’s muscle development because it supplies protein.

Is there any other better way to write above in as much lesser words as possible?

[Shakespeare's brother]

Hi, how about this...?:

For at least the first six months, breast milk is best for providing all the protein needed for baby’s muscle development.

[Uncle M]

But if it is a claim for the merits of breast milk for all babies (not just one specific) it should read babies' muscle development

It is still OK, however, to refer to all babies as baby (even without the definite article), as the sentence is aimed at mothers who are naturally concerned for their own baby and no other. So Shakespeare's Brother is quite right. Baby's in this context means your baby's.

Dave