Where does “pótmama” come from?

pótmama (Hungarian) comes from Hungarian mama, from Hungarian ma, from Hungarian -st, from Hungarian -t, from Proto-Uralic -tt.

pótmama (Hungarian): babysitter

Definitions

Step	Language	Word	Meaning
1	Hungarian	mama	mom, mum; grandmom
2	Hungarian	ma	today
3	Hungarian	-st	—
4	Hungarian	-t	Used to form the accusative case; -ed, -t. Used...
5	Proto-Uralic	-tt	—