Planning for the Baby's first birthday, the Sinclairs discover evidence that their baby may have been switched with another baby while still an egg. Earl is tantalized by the notion that there is a polite, well-behaved baby out there somewhere who might be his son. Fran is unwilling even to consider the possibility until she meets the other baby -- who looks just like the Sinclair baby except he's green and wears the exact same shirt as Earl -- and the other father shares certain personality traits with the Sinclair's baby. Though the DNA test proved that the other baby is their son. For a while of spending time with Aubrey, the begin to get a little annoyed with him for his complaining and him being a geek. So they have another test tell the doctor comes saying that the information was switched in fact that Baby is the Sinclair's real son