A 40-year-old cancer survivor is collecting breast milk from dozens of her Brooklyn neighbors to help feed her 3-week-old son.

Eva van Dok Pinkley can’t nurse Oliver herself because of a double mastectomy. Twenty-five women have already stepped up, pumping milk and donating it to the Carroll Gardens mom.

“What they are doing, it’s not easy to do,” Pinkley said. “I’m just stunned at the amount of trouble that they are going through for me. I think of them and what they have done and give thanks.”

The actress and researcher for “House Beautiful” magazine has endured multiple miscarriages and two rounds of failed fertility treatments. By the time she was diagnosed in April 2010 with noninvasive breast cancer, she had given up on having children of her own.

But a mere two months after her double-mastectomy, she got pregnant. Pinkley knew right away that if she carried the baby to full term, she wanted to use breast milk. She just hadn’t figured out how…