The National Day Nurseries Association (NDNA) is warning that the Welsh Government's offer of free childcare for all working parents is putting a strain on nurseries as it is rolled out across Wales.
The Welsh Government's Childcare Offer for Wales offers three and four-year-olds of working parents 30 hours of funded childcare and early education for 48 weeks of the year.
The NDNA said nurseries are struggling to recruit enough qualified staff to meet the extra demand. They are also having difficulties with retaining staff, particularly experienced Level 3 qualified practitioners.
Nursery manager Jackie Roberts said staff are being put under more pressure.
The Welsh Government said it agrees it is important to invest in the sector.