Breastfeeding a second time

I have 2 kids under 2, I just had my youngest 3 days ago & I am breastfeeding for the last time. My middle child I have to stop breastfeeding early due to PPD & needing to take my meds. I don’t want to latch her but I would like to start back feeding her breast milk she doesn’t drink cow milk or really any milk at all we buy monthly & weekly for pediasure and I feel by breastfeeding would save us a ton. Would this be weird? My family thinks is strange to want to breast feed a toddler but with all my kids my goal was to breastfeed past 12 months