First and foremost - remember this is a business and you are reading this because you are considering sending your young son or daughter to WORK.
Infants and toddlers are very unpredictable and of course don't take direction very well, so generally advertisers will hire several children for the same part, often paying them as little as fifty to one hundred dollars to do the job. The advertiser will shoot the job with each of the children. Whichever child does the best - those images will be used and that child will receive pay based upon standard market rates.
In smaller markets, i.e. - ANY place outside of New York, Los Angeles or Chicago, the best agencies will generally not deal with infants and toddlers simply because there is little work for them. As a result - more often than not - the child that appears in an ad or commercial is related to the client, one of the talent or production people involved in the shoot.
So basiclly every good parent is willing to do "whatever it takes" and spend "whatever it costs: Just remember - this is your child, in the case of infants and toddlers - They are not making the decision to work - You are putting them to work.
This business is filled with adults - your children must be good with adults if they are going to succeed.
Those kids that you see on TV commercials... they are not just cute kids - most of them have already had some training.
Be realistic about your ability to follow through. If you live in North Carolina and submit photos of your child to an agency in New York - they expect you to be available to work in New York. They are not going to pay to fly you there, they will call you on a Thursday and expect you there on Friday, the business does not revolve around you and your child.Last but not least. a lesson that you will be teaching your child when they reach their teens Any agency that holds out its hand and asks you for money on the first visit - is not interested in getting your child work - they are interested in your money!