Kobi was playing on the floor of The Yeoman pub in Bristol when he picked up the bag and waved it at Verity, 25, saying, "Look mum". Verity was having lunch with her friend
Alice Mullins and her son Rory, four months, when Kobi found the bag while playing with his toys.
"My little boy found this little sealable plastic bag with white powder in it," explains Verity. "Thank God he actually said 'look mummy'. I know him and he would have put that in his mouth.
"I just thought 'what the hell is that?' then straight away I thought that looks like cocaine. You don't expect something like that to happen when you go out for lunch. I didn't touch it because I thought it was drugs.
"I went straight to the bar staff and said there's something that looks like cocaine on the floor over there. We didn't have any lunch, we just left the pub and I called the police on the 101 number.
"The person on the phone asked if I still had the package on me - obviously not, I had given it in at the pub. The police basically told me there was nothing they could do unless the bar staff reported it to them."
A spokeswoman for the Yeoman, a Mitchells & Butlers pub, said: "The safety of our employees and guests is extremely important to us and we would like to formally thank the customer for quickly bringing the matter to our attention.
"The pub's manager, a respected licence holder who has been with us for many years, is currently in contact with the local police."
Avon and Somerset police spokesman Martin Dunscombe said: "Police were called with information that a bag containing a powder had been found in a pub and handed to staff.
"No information was provided about what the powder might be. The bag was left with bar staff."