Firstly, don't confuse dates of baptism with dates of birth, or assume that baptisms happened soon after birth!
Many families had children baptised in batches!

Secondly, I think there are some transcription problems here?
I double-checked with Cornwall-OPC-database. Only these baptisms show:
24th June 1605 Johonis Bowden, father Willimi
17th August 1606 Johones Bowden, father Willmi
30th March 1608 Michaell Bowdin, father Willimi
18th November 1610 Benedictus Bowden, father Willmi
5th July 1612 Johones Bawden, father Willmi