It seems like the unspoken implication is that the umbilical cord wrapped around the baby's neck, resulting in in-utero asphyxiation? However, the baby was born weighing only three pounds, which would seem to signify something else wrong prior to the asphyxiation, no?
My sister had a knot in her umbilical cord. She ended up coming out alright, but started out very thin. The cord is cut off from adequately feeding the fetus