What is a 2-in-1 vs a 3-in-1 vs a 4-in-1 vs an All Stages 8-in-1 or 9-in-1 Convertible Crib?

2 in 1 applies to mini cribs that can convert from mini crib-->twin bed

3 in 1 applies to Standard size cribs that can convert from crib-->toddler-->daybed

4 in 1 applies to Standard size cribs that can convert from crib-->toddler-->daybed-->full size bed

8 in 1 applies to Standard size cribs that can convert from bassinet-->midi crib-->midi toddler-->midi daybed-->standard crib-->toddler-->daybed-->junior bed

9 in 1 applies to Standard size cribs that can convert from bassinet-->midi crib-->midi toddler-->midi daybed-->standard crib-->toddler-->daybed-->junior bed-->full-size bed