...adult size????

We were thinking the dogs were about 12.5 weeks old.  I just came from Jitterbugs health exam appointment.  The vet saw some teeth close to erupting and thinks the pups are a few weeks older than this, closer to 15 weeks old.   I don't think they will get as big as we had projected.  Usually a medium dog will double their weight at 4 months.   I am thinking Jitterbug and Disco will be around 28lbs as an adult, cockapoo size with shorter legs.