No.
I presume this is someone holding a baby while standing at the side of the road well out of the traffic, not letting the baby crawl in the road, trying to stop cars by jumping in front of them, or doing anything actually reckless (like, say, pushing a stroller into rush-hour traffic and hoping it will stop)
Hitchhikers are no more asking to be raped than women in miniskirts and makeup.
Sure, the safest place for a mother and baby is in the back of a late-model car with a professional chauffeur, but some people can't afford that and have to share public transit with random weirdoes, or even trust a random stranger's driving ability.