Nathan told the Herald this week the company's view remained "entirely consistent" with its September announcement. He believed the grace period for new rules would be extended beyond January 1.
"The key motivation for the regulator, firstly, is to ensure that there is sufficient supply of what is an extraordinarily sensitive category, given the fact that it keeps babies alive," Nathan said.
"They need to ensure that there is no disruption of supply in what is a very large channel. Secondly, they need to ensure that there is sufficient regulation in the market place," he said.
Nathan repudiated market commentary that the company may strike issues with its product labelling.
"The insinuation was that if it was not Chinese labelling, then it would not be allowed to be sold through the channel, which we would totally dismiss," he said.
"The issue is around the English label product, which is still being sold via the cross-border e-commerce channel and daigou, which again we are very comfortable with," he said.
A2 Milk's formula is fully registered with the Chinese authorities, unlike some brands, he said, adding that adverse sharemarket reaction to regulatory changes had been a feature of this category for many years.
New chief executive Jayne Hrdlicka last month sold all her shares in the company, for tax purposes, after two months in the job, sparking a drop in the company's share price and criticism from the share broking community.
A2 Milk has said that execution of time-based rights and performance rights would lift Hrdlicka's holding beyond her original stake.
Nathan said there had been a "significant over-reaction" to the share share sales. "Both management and the board continue to hold a significant amount of stock," he said.
Shares in a2 Milk traded yesterday at $10.22, down from $12.51 just before the share sales were announced on September 21.