Anne asked:
<Will she have colostrum? For how long? When a mom is nursing a
<toddler and has another baby, does colostrum come in?

Humans feeding another infant up to delivery still go through normal
lactogenesis and colostrum, triggered by the rapid drop in
progesterone following delivery of the placenta.  (Interesting - cows
do not - their lactogenesis is different.)

<I told her how the moms of premies produce milk uniquely suited to
<their needs; will she still produce this milk if she continues
<nursing her older boy?

Milk composition is determined by gestation but also seems to be
influenced by other factors such as (possibly) feeding patterns,
duration and volume removed. If she wants to keep producing unique
pre-term milk and continue to nurse her toddler, she could restrict
the older boy to one specified breast so that only one breast
progesses from pre-term to making toddler milk.  The new baby could
have the other breast, with top ups from the toddler breast if
necessary.  Breasts are wonderful and can produce different milks.

I don't know how important this is, although it sounds like her new
baby will need priority for a while at least.  After the first few
weeks, they can all relax and do what suits them, with whatever
breast. Don't forget, toddlers can be useful for relieving
engorgement and increasing supply.

Ros Escott BAppSc IBCLC
Tasmania, Australia