I'm a software developer by profession. And I like working in my bedroom. And my 2-month-old son's baby bed is in there as well. I'm curious about the radiation and the thermal effect on my growing baby.
Working in the same room your son sleeps is more an issue of the sounds and light of your monitor you make while working rather than the electromagnetic radiation. If possible, it'd be good for nap times if you could work in a different location. If working in your bedroom is all you've got, try using a sound machine to mask the noises of you working.
The radiation that your computer emits is extremely low. You monitor is the greatest emitter of electromagnetic radiation and the effects of it are only noticeable if you spend prolonged time less than 1 foot away from your monitor. (See: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2787304/) Note: This study is related to rats and old-fashioned CRT monitors (rather than current LCD displays) were placed 20cm from the rat cages. Bottom line, you've got to be really close to a vintage monitor for electromagnetic radiation from a PC monitor to have an impact.
Additionally, new monitors emit significantly less electromagnetic radiation than the old CRT monitors. [Note: I didn't specify that CRT Monitors emitted a dangerous level of X-Ray radiation that is no longer an issue.]
If you can move where you work, I'd recommend it. Blue light and the random sounds you make without even noticing will disrupt sleep, which can impact your son's development, demeanor and amount of time awake at night.
Blue light on the other hand is a problem — not just for your son but for you and anyone else who uses electronic devices. Blue light is linked to disrupted sleep cycles and insomnia (See: https://www.cdc.gov/niosh/emres/longhourstraining/color.html)
More anecdotally, when you work you make a lot of irregular sounds. The action on your keyboard combined with altered breathing as your work can disrupt a child's sleep. With my three sons, my wife and I had to move each one out of our room by 6 months old because they would wake at night just by us turning over in bed as we slept.
All this is moot if you are not able to work anywhere else, but you can mitigate the effects of blue light and the noise of working. Use a sound machine to mask noise and turn your screen monitor brightness down and color correct your monitor to reduce blue light — not sure what OS you develop on but Ubuntu/Linux has a setting that allows for a "Night Light" blue light reduction.
Hope this helps.
"Radiation" is a very broad term. It includes things like visible light, or the infrared light emitted by your body. What is harmful is ionizing radiation. A computer does not emit ionizing radiation. There is ionizing background radiation present all the time in our environment at low levels.
Re thermal effects, a computer puts out heat, but so does your own body. If it's too warm in the room, then you can turn on the AC.
In summary, there is zero hazard to your baby from your computer due to radiation or thermal effects.
The fears of computer largely stem from CRT (cathode ray tube, the "bulky" kind) monitors from the past. They were fully replaced by LCDs (liquid crystal displays, the "flat" ones) in 2000-2010 and never appeared in mass-produced portable computers in the first place.
CRT monitors did emit x-rays that are a known health issue. Bigger monitors / TV sets emitted disproportionately more. In the last decade of the CRT development (say, 1990-2000) the x-rays were somewhat mitigated by lead additives in the glass that made the tubes even heavier (not that they were lightweight in the first place).
The problem completely went away when the tubes were replaced with LCDs. They have different working principle and completely lack a mechanism to generate dangerous radiation of any kind.
Today, all the health risks related to computers are completely visible and manageable, including the light, the heat, the noise and the attention grabbing.