in the 70s and into the 80s, in the USA, esp. when RCIA was being introduced, some dioceses, and some parishes had temporary indults to try various practices, including full initiation for entire families when one family member, adult, was being received into the Church, confirming infants (under age 7) confirmation with 1st communion (which was the almost universal norm before the 20th c.) or “restoring the original order of the initiation sacraments” a concept from RCIA, baptism, confirmation and first communion in that order. What became lost was the place for first confession, which is still problematic in some areas.
where these permissions were granted, they were supposed to be local, limited, and end at a certain time, and the results evaluated, but inevitably these limits were not always observed.
infants and children who are being baptized in danger of death, or because of serious illness, surgery etc. should always be confirmed at the same time, none of the usual preparation requirements apply.
what cannot be changed is “first confession before first communion” or “RCIA is the norm for receiving unbaptized adults (over age 7) into the Church and baptism, confirmation and first communion in the same ceremony, followed by first confession after suitable catechesis”
It was almost universal at least in industrialized nations before Pope St. Pius X lowered the age for 1st communion, for communion and confirmation to be conferred in the same ceremony by the bishop at any age over the age of discretion (about 7) which usually coincided with the end of the child’s formal academic education, and formal religious instruction, age 12-14. If that was the age children left school and began work, that was the age for the sacraments.
the age in the US is still normally between age 7 and 18, but set by the local bishop. Parishes cannot do “local options” without his permission.
bear in mind that does not refer to the Eastern Rites. There are still some ethnic or nationality parishes that retain customs of their “home” country, but there are fewer every year.
bottom line, pastors should always insist that candidates for confirmation, matrimony and holy orders present a recent baptismal certificate showing all sacraments received.