
It sounds like for 14 weeks he has way too much freedom in the house so accidents are more likely (after all you don't have eyes in the back of your head). To such a young puppy your daughters bedroom is as good a place as any, as it is away from his earting and sleeping place.
You were very lucky with your first dog, as a puppy has very little vluntary control of it's bladder until around 5 months of age, and when he needs to go he needs to go now, and if he has become distracted, or is too far away to get outside he will go where he happens to be.
The more accidents he has the more it will seem to him that toileting in the house is OK.
I would go right back to the start. Keep him in the kitchen with access say to one other room (the fam8ily/ditting room) when yu are able to watcvh him all the time. Take him out after waking, eating, playing, and every 15 minutes while he is awake,a dn maje a huge fuss of him when he performs, and give him a treat.
You will soon find him running outside and squeezing out a few drops just to get the praise and treat. This will become habit, and hopefully with no opportunity for accidents the habit will be broken of going indoors.