Hi daisybuttons,
No probs! To be safe I always wipe my breasts with water after my baby has direct BF, to clear off his saliva. In fact, it is also recommended to change our breastpads every 4-5 hours as bacteria will thrive in warm and damp conditions.
And yes, theoretically you should just dump away the portion of milk which your baby cannot finish.
As for the point on bacteria, I did ask my PD before but his answer may not directly answer your question. Basically when I just delivered and was pumping BM at home, my PD advised it is best that I should refrigerate the EBM asap, such that the temperature is QUICKLY brought down to 4 degrees or less to slow down the growth of bacteria. I suppose if you reheat the milk, feed it to baby and then refrigerate it again, the milk when refrigerated will have bacteria multiplying in it PLUS the saliva enzymes digesting it. From a medical viewpoint, it may not be recommended.
But then again, I believe all of us (including our babies) have sufficient natural antibodies and immunity against bacteria.... Sometimes I guess we all worry too much... Myself included.
I worry about contamination, about bacteria, when all the while baby Clarence has been merrily putting everything in his sight into his mouth.
By the way, I stopped dumping my milk today.... AFTER 3 weeks of dumping I decided enough is enough. Bought a box of microwave sterilisation bags (supposed to be able to use up to 60 times) from Mothercare yesterday for $14. So I microwaved the pump and the BM storage bottles for 3 minutes today, and found a shower room in my office where I pumped... Hehe....