Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Caution - May hurt baby's spine

I was considering buying one of these for our 1st baby, but the lactation consultant told that new research is finding that prolonged time spent in this carrier may actually damage babies spines because it is not a natural position for a young baby. She recommended using a sling instead because it puts baby in a more natural position. I carried my baby in his sling until he was over a year. He loved it!