Big sister book that supports breastfeeding?

I'm looking for a big sister book to buy for my daughter who will soon become a big sister. All books I find seem to reference toddler helping with bottle feeding.

I am looking for one that specifically mentions breastfeeding so that she is prepared for it. She was breastfed until she was 2, so I'm worried she might think this is her thing and not understand baby needs it too. Any suggestions??