I think the CoD got it right.
Quote
Article 17
Since we are to judge of the will of God from His Word, which testifies that the children of believers are holy, not by nature, but in virtue of the covenant of grace, in which they together with the parents are comprehended, godly parents ought not to doubt the election and salvation of their children whom it pleases God to call out of this life in their infancy (Gen. 17:7; Acts 2:39; I Cor. 7:14).
The last section clarifies it. "whom it pleases God to call out of this life in their infancy". This in no way necessitates a universalness, either to ALL infants, nor ALL infants of believers. It leaves it up to Gods calling.