Your baby is a little male. His beak is not
overgrown as in a medical condition. However, providing chew toys such as soft wood toys made in appropriate size for budgies may help with the pointy tip, which is the part I can see you’re talking about.
Not only is 3 weeks fairly new, but juvenile budgies are often not as vocal as adults are. When you see him hit sexual maturity, (if not sooner) you will probably see an increase in vocalizations.
Eating and pooping normally is always a good sign. I have a feeling all is well, but it is always considered good practice to take any new pet (including budgies!) to the vet for a new pet check up. In the case with birds, an Avian vet, or an all species vet who is experienced with birds.
Not all birds will immediately go for a cuttlebone. Although recommended, depending on the foods and nutrients your budgie is taking in, it may or may not be absolutely necessary. Some do at least seem to like the texture, and use it like a chew toy.
We have a vast collection of information here. Please read the Stickies and Articles which are provided to answer the more common or basic questions. This will help you get started with budgies, and help familiarize you with the forum. Enjoy