Pic 1 showing Estela sitting in light blue bibs in ep 29. I think prevoiusly they were a different darker pair. Blonde ponytails, sleeveless green shirt.
Pic 2 a girl in dark blue longer shortalls in ep 34.
Pic 3 a girl in colorful bibs or more likely dress or shortalls (only headshot for now) in ep 27.
Pic 4 a girl in light blue bibs or similar (brief scene only, so unknown if shortalls or dress, probably shortalls) in ep 33.
Other bibs scenes:
Ep 25: Girl in blue dress or shortalls, woman red bibs,
Ep 28: Estela sitting in light blue bibs (distance)
Ep 30: Woman in dark blue shortalls
Ep 31, 32: Fede in blue bibs (very few and brief scenes/distance)
Ep 32: Girl in light blue bibs or shortalls
Ep 33: Estela sitting in light blue bibs (side view/distance)
Ep 25: Estela blonde wet pigtails
Ep 26 +34: Boys and girls in swimwear. Boys shirtless incl. Fede