5 And inasmuch as those words of Christ Our Lord should take deep possession of your souls, "He that shall receive one such little child in My name, receiveth Me," We beg that you leave no measure untried whereby the liberality and generosity of the faithful over whom you are set may correspond to the urgency of the present need. Accordingly it is Our wish that you forthwith announce throughout the whole of your several dioceses that a collection of alms is to be made on the twenty-eighth day of this month, the feast of the Holy Innocents, or if you prefer, on the Sunday immediately preceding, for the support of the children made needy by the way and that you particularly recommend this collection to the children in your diocese; further, that with all diligence in your power you see that the money thus collected is sent either to Us or to the "Save the Children Fund," which We have before mentioned.
Source: Annus Iam Plenus (Vatican.va)