LO is almost 11 months old and I am only pumping about 1x per day at work now as he is taking much less milk with his babysitter. Last week, I noticed that the suction on my PISA seemed to be much weaker and I called Medela for some trouble shooting. I have been using my manual pump in the meantime.

While looking at my pump, I noticed that the valves had a lot of milky buildup on them (have not used them and therefore washed them since last week before the electric pump stopped working well). While I wash the flanges and parts every night, I am guilty of not always separating the valves and membranes but have never noticed this problem before.

I am extremely concerned now that this buildup has been accumulating and that I have been feeding LO milk with bacteria in it for a long time. He has never had any issues (stomach, that is), but I am really scared now that I have done something irreparable.

If LO has not been sick from this yet, should I be worried? I cannot believe I was so careless to not clean more carefully, and now I am just so, so scared.