Our twins, not sure which month, probably 2-3 months old.
As a mother, I could always tell them apart but other's could not.
So we developed a system and a saying.
Adam was always in blue and Aaron in red.
"Aaron the Red Baron, and you didn't know him from Adam."
What's funny, though Adam was in blue he became our Fireman/Paramedic. While Aaron who wore red, he now wears blue as a policeman.
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