Sometimes you will find a notation in the baptismal books, because a certificate had to be issued to act as a proof of age, birth, for a passport. All the ones I have seen are in pencil, say "krestny list do Amerika" or similar (my Czech recollection is not perfect) followed by the date. This is not a hard and fast rule, however. It's when you do find one that agrees with your data from this end that you rejoice and say, "Yes! That's the right birth record." You will also see a similar notation, usually in ink, for the wedding when it was in another parish that required proof of baptism in order to perform the marriage.
So the answer to your question is "maybe". Also, Ancestry does not have the records. You need to click on the links given in earlier posts and try to figure it out.
Also, do you know where any of the children were in the 1900 census? And any approximate birth years?