This number it's texting me threatening to kidnap my baby if my "husband" doesn't money gram or western union money. They are saying he owes money. The thing is I don't have a husband but they know I have an 11 month old son.

File a report with your local LE and your phone service provider.

For text messages: forwarding any text message spam you get to the short code  “7726,” which spells “spam” on most phones, to alert your network operator to the abuse. ATT won't accept 7726 But they will accept BLOCK and return a message that the web site is blocked. forward the texts to 7726 or BLOCK, depending on your phone carrier.
http://www.att.com/esupport/article.jsp?sid=KB115812

Why would you come here to post?  You should have called 911 and reported the threat.  As to the baby, they could have seen the birth announcement in the newspaper.

Report this to  local law enforcement.  NOW!  This is an extortion attempt, plain and simple.  You are a victim of an attempted extortion.  The police can notify the community and the media.