An email I sent to "pregnant_nursing" -- included here because of the insight I saw in the 3rd and 4th sentences of the 2nd paragraph.

Hello C,

Except for my son being 10 months old, you and I are in very similar positions. We used fertility treatment to get PG the first time, and were very shocked to discover the miracle of PG #2 "the old fashioned way". I am still nursing my son, but because my supply is very low, we supplement at night with a friend's milk and at daycare with formula.

My La Leche League group includes a couple of gals who tandem nurse a baby and a toddler, but their toddlers are closer to your son's age than my son's age. I am now 3 months along and nursing while PG isn't quite as exhausting as it was at first. I am saddened by the loss of supply and needing to supplement, but I trust that my body is putting it's energy and resources where they are needed most right now. I am determined to not lose the nursing relationship before my son is ready, even if there isn't much milk there for him to drink. Whether we tandem nurse or not will probably depend on whether he decides to wean before September with my low supply.