Consult in person..

You need to consult a dr.

Pls do online consultation for detailed discussion.

Upload face picture. This will in some way help to rule out syndromic facies. What about developmental milestones?

I would suggest for this concerns physical consultation or at least one Virtual consultation should be a better option.. because it needs two way communication..

I need to hear the sound as well as examine the child before come to conclude that he is having downs syndrome.  But at around 7-10 months child makes some noise which known as cooling and which is totally normal. It's part of speech development. If your child's development is normal and no other abnormalities and both parents age is not more than 35 years then it is less likely to be downs syndrome.

I would advise for this concerns physical consultation