New father Brian O’ Driscoll has doled out some wisdom to his newborn son Billy.

The rugby legend took to Twitter today to share the advice to his son, saying Son, if I can give u one piece of advice,never look a gift horse in the mouth!

The advice was accompanied by the image of a Dublin café, offering free coffee to little Billy to celebrate his birth! And Brian wasn’t the only one in the joking mood. Amy made us fall in love with her a little more, when she joined in on the joke in true Amy style, saying:

He’s off coffee til at LEAST next week but if I send him in can he collect one for his Ma? #knackered

The couple welcomed their son yesterday in the National Maternity Hospital, Holles Street.

It’s the second child for the couple, who already have a one year old daughter, Sadie.