It takes a lot to keep a big healthy baby boy like Flynn Bloom fed and happy — and his mommy is feeling the strain!

Breastfeeding her baby son Flynn helped Miranda Kerr lose all her baby weight in record time — but she admits it’s the toughest job she’s ever had to do!

The Aussie model has fed Flynn the natural way since he was born in January — and when she’s separated from him on a modeling shoot, she hooks herself up to a breast pump so she can express milk to feed him with later.

“I am breastfeeding and pumping,” the 28-year-old tells Sydney’s Herald Sun. “When I am at work, I am pumping. I feel like a milk maid, but it is worth it.”

Flynn’s a BIG boy too — he weighed 10lbs at birth and has grown and grown since. Miranda must be making some good stuff!

Did you breastfeed and pump, HollyMoms? Is it as tough as Miranda says?

Weigh in with YOUR experiences below!