Brandon’s grandmother was watching him while his mother was at work when he was kidnapped, police say.
The grandmother took the child inside her flat and came out for a few moments to unload groceries, police said. While the baby was alone, a man entered the apartment and took the child away, they said.
Police released surveillance video showing a man walking down a sidewalk with a covered car seat, which investigators believe was holding the child.
Police did not immediately say whether any of the suspects in custody were the same person in those images.
The suspect previously described by police appeared to be a stranger, and neither the grandmother nor the baby’s mother recognized the man, Sgt. Christian Camarillo said Monday, before Brandon was located. The child’s father is incarcerated, he said.
“Anyone who is a mother or a father, you love nothing more than you love your child,” Camarillo said.
CNN’s Stella Chan contributed to this report.