Bint makhad: completed 1 year, entered the 2nd.
Bint labun: completed 2 years, entered the 3rd.
Hiqqah: completed 3 years, entered the 4th.
Jadha‘ah: completed 4 years, entered the 5th.
The age of the due female camel is part of the legal assessment. It is not sufficient to say that “one camel” is due in every bracket.