Chin don’t really mat per se. They may get a tangle in their ear or tail occasionally.
A bath every 7-10 days will keep them smelling fresh and shedding down to a minimum.
Take care not to get water down your baby’s nose OR in ears, in the tub.
A washcloth and shampoo work well to clean around the eyes and face.
Grooming supplies available at Wheatley Wares or Ren's Pet Depot in Canada
http://www.Petedge.com in USA.
After the bath, thoroughly blow dry the coat. We use a boar bristle brush for this on babies.
I blow dry their hair backwards, from tail, towards their head.
Once she’s older, and has more coat, you may want to use a pin brush.
For those considering showing their Chin Chris Christensen systems
has a complete sample kit for drop coats
and Chris Christensen Systems Products