“All”

Thanks for your question @bturnum "All" does not INTRODUCE a sufficient condition in this case, but it does REFER TO as sufficient condition. Let's pay attention to the wording of the sentence. "Normal full-term babies are all born with certain instinctive reflexes..." Another way to say that would be "All full-term babies are both with certain instinctive reflexes..." The ALL is referring to "normal full-term babies" and not to "certain instinctive reflexes" "Normal full-term babies" is the sufficient condition

i was confused on that too