Around that age dd started only using her bowels every 9-10 days. She was primarily breast fed with solids as an added side thing/experience. It freaked me out a bit cos the day she would actually "go" she was uncomfy and when she went it was very solid and must have hurt her little tushie!

We ended up giving her watered down prune or pear juice each day and a couple of primes during food prep while she was sitting in the high chair wanting whatever we were making RIGHT NOW lol
After a couple of months (at most) her little tummy adapted to the changes with solids and it all resolved itself

Give the natural remedies a go - hopefully it will help