When could you feel baby move from the outside?

Kasie • 23·Happily Married· Mama to Ellee Brynn Heller June 1st 2017❤
I'm 21 weeks today and a FTM. I've been feeling my baby girl move since about 18 weeks, but my hubby feels so left out. I tell him when she moves and he tries to feel but can't. How far along were you when others could feel baby from the outside?