The phrase "a little bit pregnant" is an idiomatic expression that means something is not completely one way or another. It implies that there is some degree of commitment, involvement, or participation, but it is not fully engaged.
Sentences with «little breast milk»
They were exclusively formula - fed starting at 6 weeks (and they got very little breast milk before that due to my poor production). (twiniversity.com)
These conditions are not common, but when they do happen, there is no breast milk or very little breast milk after delivery. (verywellfamily.com)
It doesn't mean you are producing too little breast milk. (newkidscenter.com)