Remember, this is a big instrument, so your air needs to be big and fast to get the sound out out of the horn. Breath deep down into your diaphragm, not up high in your throat. That air has a long way to go, so start it out from a place of power. Unless you're playing a Sousaphone in a marching band, the goal is not to blow all of your air reserves through the horn at once, but to keep your diaphragm taunt. If someone were to punch you in the stomach, you should stay tight and not collapse. Tense your abdominal muscles while you play and while you blow. While blowing, close your lips to the point that it vibrates in the mouthpiece. Keep blowing and vibrating your lips so that sound gets out of the tuba. As tuba is a large brass, try blowing a raspberry into the mouthpiece. That's the kind of vibration you are looking at. Once you've got your buzz figured out, start your note by saying either "ta" or "da" into the mouthpiece, depending on how you want to articulate the note. A properly maintained "embouchure" is critical to playing brass instruments. It's difficult to buzz your lips properly when you're first learning how to play. Don't puff out your cheeks. It's a waste of air that should be going into your horn, it looks silly, and you'll end up with very sore cheeks after only a brief period of playing. At any given position or configuration of keys pressed and open, you can play a number of notes, usually three. Some beginners have difficulty hitting a note right the first time, but don't worry too much while you're just getting started. Practice feeling where the different registers are. Pinch your cheeks and your lips as you blow to control the amount of air that comes through your "buzz." You can raise or lower the pitch of the note in the same position, accordingly. Try associating how the note will sound, where the note is on the staff, what it feels like to play the note, and the fingering for it. Many beginners only associate the note on the staff and the fingering for it, so they become confused when playing notes with the same fingering but different mouth positions. Once you've started to get a feel for the register of the tuba, start experimenting with fingerings. Press the keys and practice doing so in time with the notes that you play. Whether you're studying along with a book or receiving lessons, start practicing fingering the keys fully and playing clear notes with the valves pressed. Most guide books should come with finger charts, which correspond the fingerings to the specific notes on the scale that you want to play. This is an excellent way to learn to play. Push the valve in the center, not on the rim. Pushing it on the rim can make the valve stuck.
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One-sentence summary -- Breathe from your diaphragm. Buzz your lips. Practice changing notes without pressing the valves. Press the valves properly.

any puppies that can't get food from the mother. If the mother dog has too many puppies and not enough nipples, quick action is needed. You must hand feed this puppy right away and it should be done every 2 hours. No children below the age of 12 should feed, or even hold, the puppies before their eyes have opened, as puppies can be fragile. The mother should stay in the whelping box for at least 5 days before leaving her puppies for a short while. During this time, she will either be caring for her puppies, eating, or resting. The only exception to this is if she needs to go outside to go to the bathroom. If the mother tries to leave the whelping box, coax her back to her puppies with a treat or encouragement. If the mother is doing her job, you won't have to do much care for several weeks, other than to monitor the puppies' development. Make sure that the puppies have opened their eyes at about 2 weeks of age. They should grow in size every day and movement should increase daily as well. If any of the puppies are falling behind in development, contact your veterinarian. Use your scale to weigh the puppies every day. Make sure they are gaining weight. If there is a puppy that is not gaining at the same rate, give it some formula to help it grow in size. When a puppy opens its eyes depends on the breed of your dog and puppies, as some puppies' eyes can open as late as 3 weeks after birth. The larger the litter, the smaller the pups will be. However, in some litters, you will get a runt that is markedly smaller than the other puppies. In most cases, you will need to hand feed the runt using bottles of formula in order to help it develop properly.
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One-sentence summary --
Feed Keep the mother and puppies together. Keep an eye on the development of the puppies.