Where does “tamanhinho” come from?

tamanhinho (Portuguese) comes from Portuguese tamanho, from Old Portuguese tamanno, from Latin tam magnus, from Latin tam, from Proto-Indo-European téh₂m, from Proto-Indo-European séh₂, from Proto-Indo-European só — this; that.

Ancestry of “tamanhinho”, step by step

Step	Language	Word	Meaning
1	Portuguese	tamanho	very large, huge; size
2	Old Portuguese	tamanno	very large, huge
3	Latin	tam magnus	very big; size
4	Latin	tam	so, so much, to such an extent, to such a degree
5	Proto-Indo-European	téh₂m	—
6	Proto-Indo-European	séh₂	—
7	Proto-Indo-European	só	this; that

Every word from Proto-Indo-European só →Every word from Proto-Indo-European séh₂ →Every word from Proto-Indo-European téh₂m →