Breastfeeding and environmental sustainability

Breastfeeding is zero waste.
How much does Breastfeeding save a family approximately, compared to formula feeding?
a) $2000 to $4,000 dollars annually
b) $1,000 to $1,500 dollars annually
c) $5000 to $6,000 dollars annually
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Answer: Approximately $2,000 to $4,000 annually