First, let's look at the stat's:
The Baby Face's Blaster will slow the Scout down from 400 units/second, 133% of the normal movement speed, to 360 units/second, 120% of the normal movement speed. However, for every point of damage dealt with any weapon, the Scout builds up a "Boost" meter (though the minimum Boost gained from any damage dealt is 5%). As the Boost meter charges, the Scout's speed will increase linearly from 360 units/second to 520 units/second (173% of the normal movement speed). The Boost meter fills completely when the Scout deals 100 points of damage using any weapon. If the Scout jumps mid air while using the Baby Face's Blaster, the Boost meter is reduced by 25%, causing the Scout to lose momentum. Ground jumps will not reset the Boost meter. Similar to many On-Hit effect weapons, shooting an invulnerable enemy will still fill the Boost meter, and shooting disguised Spies will not grant boost.

So, you start slow, then shoot some peep's, and go REALLY FAST. Really, it's hard to stop to get on a teleporter! it's a bit like the spy's kunai, you start week then get super! so, let's see how we can use this weapon

Now then, this is how I use it, you may use it someway else, but this is how i prefer to use it.

This weapon is the perfect way to get the attention of some people, run away, then come back. sometime's, they can just follow you even though your WAY faster than them, which mean's that's less guys for your team to handle on the front! Great! But, i ALWAYS use it, even when we are not play a gamemode with cart's in. Why, you may ask? Well, when you get full boost, you can go very fast, giving you an advantage in combat with anyone exept another scout with the baby face. You may only get 4 shots, and they may have more, but you can easily run around them while you reload. A perfect example of this is shown in the video below, which is by my idol of TF2 Star_ All this video is his and i DO NOT claim to own the video in an legal manner, i am just using this to help people.

So, this is one of my "Smaller Guides," and in future i shall be making more for more game's! Please Rate And Comment since it really does help! see you next time!