HELP ASAP please! I found a baby mouse!

I found a baby mouse outside after seeing my dog drop something on the ground. From the research I’ve done- It’s almost 2 weeks old. It’s eyes are closed but it has fur. My mom literally wants me to leave it to die but I’m a HUGE animal lover; I will NOT purposely let it die. I wasn’t sure what else to feed it other than “kitten formula” which I do not have access to. So i fed it some organic milk diluted with water. It drank what I gave it. Then I turned on my 14 watt lamp and heated up half the plastic container I put him in so it would stay warm. Is there ANYTHING else I can do? Or should I finally give in and leave him to die?