While swimming breaststroke, it is important to properly position your head and body to avoid neck injuries. It also allows you to swim with good technique and maximum efficiency.
I often see occasional swimmers swim with their head above the water all the time. This is fine if you swim seldom, need to orient yourself in open water or don't have swimming goggles at hand.
However, otherwise, you should learn to put your head under the water between inhales for the following reasons:
Now, let's imagine that you do submerge your head while swiming breaststroke. In that case, another error to avoid is looking at the end of the pool when you are about to inhale or during the inhale.
Again, if you do this, you are most likely extending your chin forward and straining your neck. Now imagine doing this hundreds or thousands of times each week for a few years. Now I hope you see how this can become a problem.
So, ideally, here's what happens to your head during one cycle of swimming breaststroke:
While swimming breaststroke, if you do put your head in the water between inhales, your body will always alternate between two positions:
Part of becoming efficient in breaststroke is finding the right trade-off between the time spent in each position. You should try to get into the streamline position as fast as possible after the inhale and then keep that horizontal position for as long as possible, but not for so long that you come to a halt.
Now that this has been explained, here's how your body should be positioned during the breaststroke's cycle:
This alternation between a horizontal position and a more oblique position is not unlike the kind of body movement you can observe during the body undulation of the butterfly stroke.
We have now have seen how you should position your head and body while swimming breaststroke. If you don't do it already, get into the habit of submerging your head after the inhale.
And make sure you get a pair of swim goggles and maybe a nose clip if you want to avoid water getting into your eyes and nose. Those are really inexpensive items and will last for a long time.
Have fun!