That would only be true if you were speaking about the isolated fat. The fat content in human breast milk varies as does the fatty acid composition.
Besides it does not really matter, what matters is that breast milk is what human infants are supposed to consume unless the mother’s or their health makes that impossible.
A medical student was asked on an exam why mother’s milk is superior to formula. He wrote,
1. It’s always fresh.
2. The cat can’t get at it.
3. It comes in such a cute little container.
He passed.
;^)
The definition I gave is the quickest and least complicated definition of saturated vs. unsaturated fat that I can give to a layperson. I find that when I start getting into the level of detail that I had to learn about the subject (since I'm a PhD life scientist), people don't understand and I lose them. Of course, the actual chemistry of fats is far more complex than a simple test of whether the fat is solid at room temperature.