Hi, congrats on your baby!
I definitely agree with CooperDragon!
Ok so, you DEFINITELY need a basking lamp. Bearded dragons, like most reptiles, use the heat to help them digest their food. If they do not have a warm enough basking spot, they can't digest their food properly, which can lead to serious issues such as impaction. So you definitely need a basking lamp. You need a bright white light, not a blue or red one, as these are more unnatural. You can even use a house light if it gets the temps high enough.
Next, coconut husk is a bad option for substrate. It is a loose substrate, which should altogether be avoided, especially with young babies. You might get lots of different opinions on this, as it can easily cause impaction, so some say better safe than sorry, while others say they'll watch carefully, but I definitely think you should avoid it. The best are newspaper, paper towels, ceramic or slate tiles, and non adhesive shelf liner. The worst possible is any type of loose substrate - bark, sand, coconut husk, sawdust, etc.
With the heat mat, be careful that it doesn't get too hot, as they have a gland or something on the top of their heads, so they can't sense heat from the bottom, and so can easily burn them self.
With the temperature, you should have three zones: warm side, cool side and basking spot. Your warm side should be between 90 - 100 degrees, your cool side should be between 80 - 90 degrees, and your basking spot should be between 100 - 110 degrees, for a juvenile it is better to stay at the higher end of these ranges, as they need more heat than adults do, so as your baby grows you can simply add a dimmer to control the temps, or leave it as is. At night, make sure it doesn't drop below 60 degrees, if it does you need to add a CHE (ceramic heat emitter). Do not use lights at night, as it disturbs their sleep. Some people keep their tank warmer at around 80 degrees at night, but again, this should be avoided. In nature, it gets cooler during the night than during the day, so you need to try and simulate that. Just keep it between 60 - 65 and you'l be fine.
How are you taking your temps? Dials are often inaccurate by 20 degrees, as are stick on thermometers. Digital thermometers with a probe are good, but a temp gun is the best if you can get one (you can order them on Amazon)
Lastly, what are you feeding your beardie? Remember that whatever you feed them it has to be smaller than the space between the eyes, or impaction can occur. Your baby will probably not be interested in salads just yet, but keep offering it anyway, as s/he won't learn to recognise it as a food source if it isn't constantly offered. Here is a great site to help you with what fresh food to feed.
http://www.beautifuldragons.com/Nutrition.html
Wish you the best with your baby, feel free to ask lots of questions - its the only way to learn! And pics are always welcome :wink: