Should I keep my breastfed baby upright after feeding? She is 2 months old.

Ya, I think you should do that, so that she burps and takes out the air she has taken in while drinking the milk. Once, she has burped, she won't take out the milk and would remain comfortable, else she would be uneasy till the time she hasn't taken out that air. http://www.nhs.uk/conditions/pregnancy-and-baby/pages/bottle-feeding-advice.aspx