Nope, just wondering what other pieces of doctrine are optional.
You have some evidence where limbo for unbaptized infants was proclaimed and declared infallibly as a dogma of the Catholic faith?
Or are you just talking out of ignorance?
Limbo for infants was and is a theological speculation. We have no Divine Revelation on this subject. We are free to have ideas about the subject, but none has been declared as revealed truth.
SD
Limbo has never been defined as dogmatic.
For instance;"Angels exist": this is a dogma of the Church.
"An angel appeared at Fatima, Portugal in 1917": A private revelation --- approved (as having nothing contrary to Faith and morals) by the Church, but, like all private revelations, not a binding doctrine.
"It's good to thank your Guardian Angel for guarding over you": a widespread pious practice, not a religious obligation.
I admit it can be somewhat confusing until you look into it further. I've got to look stuff up in the Catechism all the time.
Can you refresh my memory, where are the doctrines of "sola scriptura" and "sola fide" in the Bible?