Does she keeps crying when you start pushing the pram as well? Is the pram padded inside? Maybe she feels it cold. If it's still happening, try going out with a baby carrier instead
It helped us to have one of my used shirts in there and to move the pram. The movement helps settle her and put her to sleep but there have been times when she’s screamed her head off as soon as she woke up in the pram. Sometimes they just want comfort and it’s hard to out them down, other times they are fine
I've started to experience this too. But he liked the pram to begin with and now at 6 weeks decided he'll much rather be attached to mummy's hip. Have you tried a sling maybe?