Leaving 1 1/2 year old for 5 week for work training?

I have the opportunity to change jobs. New job would be way less stressful, more money, and better benefits. However, it would require me to attend a 5 week training on the other side of the country (I live in the Midwest, training is on the east coast). My son would probably be around 18 months at the time. My husband is a great dad, but he’s never been alone with him for more than a couple of hours and I’ve never been away from my son overnight. I’m really struggling with the decision because of this training. It’s only a one time thing but just thinking about it makes me tear up. What would you do?

Posting anonymously on the off chance someone I know is on this app as well. Thanks in advance for reading.