So far the response has been great, she says. But Mrs Cumming, who lives at Pakaraka, hopes to feed her son mother's milk for at least another six months. Having breast-fed for almost the last four years, and at times with tandem feeding involved, being unable to feed naturally had been heartbreaking.
"I had a plan to work on with one breast and then all of a sudden that was it," she said.
In April this year she discovered a lump in her left breast. Initially the lump was sore and the milk flow came and went.
Mrs Cumming never felt ill but the lump was painful and a visit to the doctor then led to an appointment at a breast clinic.
It was invasive cancer, but worse news was to come.
During the last check-up with the doctor - 10 days out from operation day - a lump was found in her right breast.
Mrs Cumming described it as "pretty much the worst day of my life".
After the life-changing news, she wrote on her blog: "It's not fair, my babies have the right to be breastfed.
"I worry that I don't know how to mother without breastfeeding.
"How will I console them the way they need it? How will I stop the middle of the night wake-ups, without a nipple to offer? How will I hold my baby while he nuzzles at a bare chest and still be able to meet his needs? I feel like I am lost."
Both of her breasts were removed.
"Every baby has the right to be breastfed ... it's about giving them the best that I can give them. But sometimes it doesn't work out that way," Mrs Cumming said.
"You do what it takes. To me it seemed so simple. I can't give him my milk so I will give him someone else's."
An old school friend, Kim Thompson, had been crucial in co-ordinating the collection of breast milk from around the country and delivering it to Northland.
Though the response had been fabulous, Mrs Cumming still would like to know there was a constant supply.
Bastian has started eating - with capsicums and peas on the like list - but ideally she would like to have a breast milk supply for the next six months.
"I'd like to feed breast milk until he is 2 but I'm under no illusions. If we did another six months that's all I could ask for."
Her preference is for non-smokers and she can help with obtaining antenatal blood tests from midwives.
Mrs Cumming said her husband, Daniel, had been a rock and supported her totally through the journey. Her other two sons, Charlie, 4, and Raife, nearly 3, were also adjusting.