Doctors' worries over being undercut means free care for under-6s unavailable after hours.
Parents from some low-income Auckland suburbs face paying up to $25 for young children to see a doctor at an after-hours clinic, despite subsidies intended to reduce the charges.
Child advocates are upset that not all of Auckland's network of 11 after-hours accident and medical clinics are free for children under 6.
The top-up patient fees were not abolished at White Cross Ascot in Greenlane and three other after-hours clinics because in talks on fees in all age groups, GPs' representatives did not want patients being diverted to cheaper after-hours services nearby.
Waitemata and Auckland district health board meeting minutes record concern from the chairman of the Auckland Regional After Hours Network, Ian Scott, that families in low-income areas such as Glen Innes faced a $25 fee for under-6s at the Ascot clinic - or a longer drive over to the Otahuhu White Cross for a free consultation.