It's not up to you declare that. And it contradicts traditional Catholic teaching.
[Fr]Harrison point outs, correctly, that there is no previous magisterial statement to the same effect as CCC §1261. He notes that the only previous universal Catholic catechism, that of the Council of Trent, affirmed categorically that no means for attaining salvation remains for infant children other than baptism. In support of the Tridentine teaching, Harrison cites one older magisterial statement (a letter of Pope Innocent I in 417), and three subsequent statements of magisterial import. The weightiest is from the Provincial Council of Cologne (1860), not because it was a local council, but because its acts were confirmed by the Holy See and contain the statement faith teaches [ fides docet ] that infants who die without baptism, since they are not capable of this desire [for baptism], are excluded from the heavenly kingdom.
The Council of Trent is often used in forum, yet there has been a great deal of history; papal documents and the Second Vatican Council since then... What about the Holy Innocents? They were Jewish, yet we celebrate them as our saints...
Oy. There is so much being presented as Catholic which is not. I don't blame these folks though. They have been taught a new religion for decades.