Older women yelling at me. I'm a new mother?

Ok so I'm in my late late 20's but I look young like 15-17 (I know that does sound hard to believe I could look that young but I do). I've just recently had a baby girl. When I'm taking her out for a walk I get older women yelling at me telling me 'to get out of the way!' they call me 'sl*g' and other things. I cracked it with a woman the other day telling her I'm 28 and to grow up. I'm really hurt by these women talking to me this way. I'm close to my 30's, have a husband who has a good job, we'd been planning this baby too for a while. What can I do? Please no mean answers. Thanks.