Actually baby carriages aren't that popular in America anymore. I remember growing up in the fifties and sixties you saw them everywhere. Nowadays kids are either strapped to an adult or a car seat.

USA's birth rate is 1.6 versus Poland's 1.1 when both need to be 2.1 to maintain the population. What I do not know is if the large number of Polish men who left the country for employment are somewhat affecting that number.