When I can take new born baby out? My husband said, we can take baby out since 3 weeks while my mum said after 1 month

Baby has been out since birth since your baby was most probably born in a hospital. In the first 6 months of their lives, babies survive on the immunity of their mothers which were passed to them when in the womb. Hence immunity for newborns can be quite decent. It's more to your comfort level. Anyway in the first week your baby needs to leave the house to see the pediatrician as well and for other vaccinations along the way. I've also seen a 3 day old baby beside me in a Moses basket when I was at the salon. So I think it really doesn't matter.