Whe do you get your baby at night?

Brittney • I`m 32 years old and have a almost 2 year old son (bday 9/3) and pregnant with our little girl (due 10/4)
My little guy is 7 weeks old and sleeps 4-5 hours in his first sleep stretch then is up every 1-2. I usually get him when he starts to fuss consistently but not wait until he cries. He is in a bassinet next to me so I'm not sleeping while he fusses. When do you get your little up to eat/diaper change? Do you change the diaper with every feed?