There's no internal consistency in these doujins! Why can't Maki breastfeed their new baby when Nico was able to breastfeed their first baby?!?
A reply after a million years, but I also wanted to comment about this inconsistency because Maki actually has decent sized breasts, and Nico, having like 71cm but can breastfeed somehow was so weird to me. And then I realised, it's just another unfortunate 'lul no breasts' joke that actually pertains to both Dia and Ruby who are a bit lacking in that area too. This entire thing was a setup for the shilling Dia and Ruby. Well played.