You have had two answers to your original question which gave us little information. Are the doctors the ones that were recommended by social services? If they haven't asked you to plead to a neglect or dependency finding I don't see how they have jurisdiction to take the child for this long. AGAIN, you need a lawyer, not just advice since you seem not to understand the procedures in this type of case.
I second the suggestion that you obtain counsel to actually review your case and represent you. The answer is that DHS can probably take as long as they want if you do not take action and obtain representation. If you cannot afford to hire counsel, you need to contact an organization like Colorado Legal Services Corporation to see if you qualify to have an attorney appointed for you.
You can reach Harkess & Salter LLC at (303) 531-5380 or info@Harkess-Salter.com. Stephen Harkess is an attorney licensed in the state and federal courts of Colorado. This answer is for general information only and does not create an attorney client relationship between Stephen Harkess or Harkess & Salter LLC and any person. You should schedule a consultation with an attorney to discuss the specifics of your legal issues.