Whom does Jesus refer to as 'infants' at Luke 10:21?

At Luke 10:21 we see : > At that same hour Jesus rejoiced in the Holy Spirit and said, “I thank you, Father, Lord of heaven and earth, because you have hidden these things from the wise and the intelligent and have revealed them to infants; yes, Father, for such was your gracious will." Elsewhere, we see John addressing the faithful, so: > My little children, I am writing these things to you so that you may not sin. (1 John 2:1) My question is: to whom was Jesus referring as infants at Luke 10:21 -- to the infants around, or to his followers of simple faith? What does the Catholic Church teach us about the usage of 'infants' in the above-said context?