How long can i put my baby (3 mths old) in carrier when out?

As Long as u want. Because it's very flexible and convenient to use than a baby stroller or sling But pls bear this in mind! If u do intend to use the baby carrier for Long term. Make sure u do not allow the baby to get to comfort in the carrier once its get older or even nap too much on the carrier. Negative (Baby Carrier) Example: Using the carrier as a sleeping/napping solution. Baby can or only want to nap on carrier and having hard time falling asleep elsewhere ( own baby clot or even stroller) Pls try to avoid that as u will have a hard time getting the baby to break that habit in the future. I had to carry my boy around the house so that he can fall asleep on it during the day/night before putting him down to sleep.