There are separate chord-forms for chords having their root note on the third, fourth, fifth, and sixth strings. For a six-string guitar in standard tuning, it may be necessary to drop or omit one or more tones from the chord; this is typically the root or fifth. The layout of notes on the fretboard in standard tuning often forces guitarists to permute the tonal order of notes in a chord.
While four years old is a little young for formal guitar lessons, it's not too early to begin teaching your child musical concepts that will be important once they are old enough for guitar instruction at School of Rock. Your 4-year-old can participate in the Little Wing music program to learn fundamental concepts through fun, dynamic musical activities. 
The Guitar Center Lessons curriculum is based on a progressive advancement model. This proven method provides a well-defined roadmap of the material covered and skills taught so you can easily track your past and future progress. Since we use the same curriculum in all locations, students have the flexibility to take lessons from any instructor at any of our locations and progress through the same content. Our program is fun but challenging–both for beginners and serious musicians who want to improve their existing chops.
Phosphor bronze strings have a warmer sound with a smooth (if somewhat understated) high end response. This makes them a great fit for genres that benefit from a mellower tone, like a lot of folk or finger-style work. These strings pair well with smaller bodied guitars, though many musicians who play more relaxed genres prefer these strings on larger bodied instruments as well.

With the C major chord, put that shape on the guitar for thirty seconds, take it off, shake it out, and repeat the process a few times. As you’re making the shape, remember to come right behind the frets on the tips of your fingers. When you’re starting out, you may have to place each finger down one at a time, but that’s natural. You’ll get better with time and eventually be able to go right to the chord.

Unlike many string instruments which use a bow to create a sound, guitars are played by plucking or strumming the strings on the instrument, which vibrate to create a sound. Chords are played when the guitarist holds their fingers down on more than one individual string to change its length, which in turn changes the frequency of the vibration created - in other words, it creates a different note. Performers often use guitar tabs, rather than sheet music, when learning music: this acts as a kind of 'map' to teach guitarists where to put their fingers on the strings.