The picture of Mrs Colletti, 26, and the two boys, who she dubs ‘milk siblings’, has divided users on Facebook.
‘Happy World Breastfeeding Week!’ Mrs Colletti wrote.
‘I watch her son while she works and have been feeding them both for a year! So much love between these milk siblings, it’s a special bond between us all.’
‘He was having issues with the formula his previous sitter had given him and his issues resolved when formula was no longer necessary.’
‘My friend and her son live with me and my husband. She knows everything about me and trusts me with the care of her child,’ Mrs Colletti said.
‘She knows I want nothing but the best four our boys, which is why she supports me breastfeeding our babies.’
The post, which has since been liked more than 500 times, received a mix of positive and less supportive responses from users.
‘Wet nurses saved many lives years ago,’ another said.
WHAT IS A MILK SIBLING?
Milk siblings are non-related infants who are breastfed by the same wet nurse.
‘Milk kinship’ was the practice of forging relationships or bonds between two infants nursed by the same non-biological mother within communities.
Mrs Colletti has since considered removing the post altogether due to the negative feedback and other users hassling her.