Help dating this baby boy set from el salvador

[ambrosia]

Not sure when this piece originated. Also not sure of the material. Feels like a thick muslin/ cotton but not sure. No tags.
Embroidered embellishments.
grateful for any guidance!

 

[Circa Vintage Clothing]

Hi Ambrosia - what's the top of the trousers like? A fly, elastic or drawstring or...buttons...something else? Construction may have clues.