My 3 week old is showing signs of an early cold...he has a doc appointment for his weight tommorow…

My 3 week old is showing signs of an early cold...he has a doc appointment for his weight tommorow but im so afraid of taking him out (as i have been since he came home) because of the weather and germs smh...only time he went outside is to go to docs and wic appointment and he was so bundled up so im nt understanding..my daughter hasnt been here its been just me nd lil man really in the heat at home so im not understanding..im gonna take him to his pediatrician then back in doors ....my poor baby i feel like i might end up staying home till hes atleast 2 months smh i need a home job