Girls, the baby is three weeks old, what do you think... Can I go to the…

Girls, the baby is three weeks old, what do you think... Can I go to the country house? 20 degrees outside, if it's been out in the sun for so long, will he get sick? Of course, in a stroller, in the shade will be fine. I don't know, it's my first child. And I should abstain, or go? Such weather is wonderful, well, I don't want to sit at home, and she wants to be on the air)