Partner doesn't wake up to baby crying

I don't know if anyone is in the boat because everyone I've spoken to about this can't relate, just wondering if there is a solution. At night, my partner never hears our baby cry even though the cot is in our room. The baby can shout and scream or cry for an extended period of time and my partner doesn't even stir in his sleep he's such a heavy sleeper. The result is that I've had to every night shift with the baby since he was born because my partner would not hear the baby cry if he was left alone with him, I've not had one night of uninterrupted sleep in 7.5 months, now I'm ill and feel I can't recover and rest properly as I'm getting up multiple times in the night still. Is anyone else's partner like this where they're such a heavy sleeper they don't hear their own baby at all? Or was anyone's partner like this and they somehow got around this? If so, what did you do? The weird thing is that my partner will wake up if I say his name, yet crying, shouting, screaming doesn't?? 🤔