A six-month old Thai boy known simply as "Gammy" was abandoned by Australian surrogate parents when they discovered he had Down syndrome and a congenital heart condition.
Ms Pattharamon - who became a commercial surrogate to settle personal debts - has been left with the critically ill child in Bangkok. She reached out to several Thai charities for financial support.
The news of Ms Pattharamon and Gammy's situation spread throughout Australia on Friday, leading to tens of thousands of dollars being pledged to the Thai woman and child through an online fundraising site called "Hope for Gammy".
The largest pledge has come from a Bangkok-based fertility doctor Dr Pisit Tantiwattanakul, who is involved in surrogacy deals charging up to $42,000 for western couples.
Using surrogates to have children is banned in Australia, with many couples going to locations like Thailand and India to have surrogate children.