You asked

Which are the best games to play with a nine month old?

Between the ages of nine months and one year, most children will make the developmental leap between crawling and cruising or walking. Your child is learning fast, but there are still lots of ways you can help, by playing developmental games with him or her.

Filling, emptying and stacking are favourite games for this age group, as are arranging objects. Offer your baby plastic containers and other safe items to play with, or invest in large, easy to stack blocks.

To encourage cruising and walking, you could try placing a favourite toy or some other child safe object at the far end of the couch. Demonstrate the idea by ‘cruising’ along to it on the side of the couch. Your baby may think it’s funny, but they’ll probably get the idea!

Add bath toys to the bathtub! By this age, your baby is probably sitting in the tub, and toys that squirt, swim or that you can catch in a net will add fun to bath times.
Play mimicking games. Either copy what your child does, or encourage him or her to copy what you do. It should result in lots of fun, and helps develop co-ordination.

More questions

By the time your baby is three to six months old, they’re ready for more interactive developmental games.
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Sandpits are fun, as long as your child is supervised, but they’re not without their risks, so exercise a little caution.
While it may seem that young infants can swim, this is actually an involuntary reaction.  Your child actually does not know how to swim.
Babies of nine months to one year old are on the brink of toddler hood. Play games with your toddler to be to encourage development.
Six to nine month olds are on the brink of learning to cruise or walk, and they’re likely to be very mobile, and gaining dexterity. There are plenty of games that encourage those skills.
Play is how your child learns about the world, and it’s one of the most important things he or she will do throughout early childhood.
Reading to your child is possibly the most important thing you can do for his or her linguistic development.
Since music affects your child’s mood, what you play, and when you play it, can have an impact.
There has, as yet, not been any concrete proof made for this question, but the positive effects of music have been proven in other areas.