The victim, a four-year-old boy, had gone to the toy shop in Ipswich with his mother before dropping the cash on the floor by accident.
Following the theft of £60 from a four-year-old boy, police have released a CCTV image of a man.
The child and his mother had gone to a Smyths Toys store.
After accidentally dropping the cash on the floor of the shop at the Anglia Retail Park on Bury Road, Ipswich, an unknown man picked it up.
He then left the toy shop without handing in the money.
The full portrait of the suspect has been released by police who wish to speak to him in connection with the incident.