"I think Plunket is a bit of a shining star in assisting mothers and motherhood and mothercraft. I think that makes a difference.''
Mrs Brown said she received good support from the organisation after having her son, 3, and nine-month-old daughter. Local coffee groups also provided good support, she said.
However, financial support for Kiwi mums could be improved to bring it in line with Australia and several other countries, Mrs Brown said.
"We had to scrimp and save and I had to jump in and out of the workforce.''
Plunket spokeswoman Nikki Hooper said mothers told them the level of help and support they got made New Zealand "a great place to be a mum''.
"New Zealand's Well Child service, which is free to all New Zealand parents, is a great source of support to families and is something that is unique to New Zealand. This is undoubtedly a huge factor in our ranking.''
Niger is among seven countries at the bottom of the list facing a food crisis.
A lack of essential food caused more than a third of child deaths - more than 2.6 million a year, said Save the Children.
The direct cost of the crisis affecting the developed and developing world is estimated at $20 billion to $30 billion a year.
Mother's breast milk saves a million children a year and programmes were needed to ensure all mothers had the support they needed to breastfeed, said Save the Children New Zealand chief executive Liz Gibbs.
2012 Mothers' Index Rankings
TOP 10 BEST PLACES TO BE A MOTHER
1. Norway
2. Iceland
3. Sweden
4. New Zealand
5. Denmark
6. Finland
7. Australia
8. Belgium
9. Ireland
10= Netherlands
10= United Kingdom
TOP 10 WORST PLACES TO BE A MOTHER
1. Niger
2. Afghanistan
3. Yemen
4. Guinea-Bissau
5. Mali
6. Eritrea
7. Chad
8= Sudan
South Sudan
Democratic Republic of the Congo