When Pam brings the children into the office, Creed says "Hey Angela's back with her baby". It has been established throughout the entirety of the series that Creed is absent-minded and oblivious. He often calls co-workers by the wrong name.
Before leaving the office, Phillip (Halpert), is crying, Cece is running around, Jim asks Pam for the pacifier. She says that she's looking for it. Seconds later, Jim puts Phillip in the stroller and has a pacifier right there.