Forever blowing bubbles!

Last Christmas our son gave Hubby a beer-making kit - which he was so chuffed with.  It's been such a busy year, but finally Hubby has been able set it all up in his Den and give it a go!  Every day now he is hoping that today is the day the bubbles have stopped, so that he can bottle his long-awaited beer.  They pause sometimes and he thinks they've stopped.. but then they start again!!  I know nothing about brewing beer, but apparently if he bottles it too soon - before the bubbling fermentation has stopped - the beer will be too weak.  Don't think he's going to wait much longer though!