Do you have a picture of the old crib?
If you are handy- you can DIY or find a woodworker in your area to add more rungs!
There are safety reasons old cribs can't be donated to Goodwill, etc. Saying this, I did use the old "family" crib for both my kids but there are things that must be checked.
Crib standards that went into effect on June 28, 2011, visit their Crib Information Center.
Safety first, especially with a baby! Why not re-purpose it into a bench for outdoor or porch use ( clean, sand, paint, lots of pillows.