We don’t need to wonder. Women are routinely subjected to DV shortly after the birth of a child or a positive pregnancy test. In this case, if it is her partner, not only is he a nasty DV perpetrator I’d bet he’s using the death of their child as his excuse to ramp up his abuse and blame her.
I remember after my 4th or 5th miscarriage my then partner blamed me for all the babies I’d lost. That I was murdering them. That I wasn’t a real woman because his ex wife managed to carry to term. His hostility and blame towards me got worse after each miscarriage then a few weeks after my 6th and final miscarriage he attacked me, told me if I ever got pregnant again he’d make sure I wasn’t because I wasn’t fit to be a mother as I was a baby killer essentially. I left, not knowing I was pregnant again. DC was born the following year and my EX has never had any real contact with DC.