Playing in their first match together since September, Northern Ireland took the lead after just 10 minutes. A mistake from Wales keeper Grace Thomas-Parr allowed striker Shannon Holloway to open proceedings.
However, the home side equalised soon after as Number 11 Lois Regan scored from a freekick to level.
Shannon Turner kept the hosts at bay with three great saves to take the two teams into half time at 1-1.
It wasn’t 1-1 for long in the second half as Wales got their second goal of the afternoon. A cross from the left met the head of Northern Ireland defender Clara Mulvenna to put the hosts 2-1 up. Soon after, Chloe Chivers gave the Welsh their third.
Northern Ireland didn’t give up and created a nervous finish as Hannah Doherty made it 3-2 with a free kick from 25 yards but it wasn’t to be enough.
The Under 19’s now have their eyes focused on the UEFA European Championship Elite Stage qualifiers in April to be hosted in Denmark.
Northern Ireland: Shannon Turner, Courtney Moore, Hannah Doherty ©, Teresa Burns, Clara Mulvenna, Sarah Haddock, Annie Timoney, Victoria Carleton, Shannon Holloway, Chloe McCarron, Samantha Kelly.
Subs: Jessica Poots, Kirsty McCaughtry, Broadie Olive, Hayley Anderson, Emma McFarland, Sarah McKillen, Alison McMaster, Chelsea Sheerin, Harriet King
Wales: Grace Thomas-Parr, Lauryn Lyons, Niamh Tinman, Imogen Lancaster, Shaunna Jenkins, Amelia Ritchie, Jenni Buckley, Charlie Estcourt, Chloe Chivers, Ellie Lake, Lois Regan.
Subs: Aimee Watson, Aleisha Cruwys, Gwen Davies, Evie Gane, Caitlin Morris.