The scheduled baby bonus increase will not be phased in, federal Health Minister Nicola Roxon says.
Two academics want the mid-year increase to be phased in to prevent women delaying births to be eligible for the bonus.
The bonus, introduced by the previous Howard government in 2004 as a means of boosting birth rates and as an alternative to paid maternity leave, is due to rise to $5,000 from $4,187 on July 1.
Ms Roxon said the government would not phase-in the payment and any delays would be one or two days not months.
"I think this is a little bit overstated, I would be absolutely confident that doctors will be giving their patients the best clinical advice.
"I really think this is around the margins, probably a matter of a day or two rather than there being some serious issues of doctors advising women to wait an extra month.
Australian National University economist Andrew Leigh said it is an unhealthy incentive for women to over-cook their babies, with about 1,000 births delayed in 2004 so that mothers were eligible to receive the bonus.
Meanwhile Ms Roxon has also rejectedclaims the government has been too slow in introducing paid maternity leave after referring the question to the Productivity Commission.
Ms Roxon has told Channel Ten there are number of points which have to be taken into account.
"Labor is committed to making a difference and we have asked the Productivity Commission to tell us which method for paying such an entitlement will work best both for mothers and their families but also for the economy and for business."