How do I get my baby to sleep somewhere besides my arms?

Kayla • Part time dental hygienist and full time mommy of 2 daughters, ages 4 and 2. Thinking about baby 3.

She is 3 weeks old and my 3rd baby. I can’t figure out how to get her to stay asleep at night or during the day for any time longer than 1-2 hours without being held. I am breastfeeding and I can tell she likes to just be by my boob to sleep, but I’m not sleeping and I have a 5.5 and almost 4 yr old to take care!

Advice please!