Una had been keeping a low profile since Aoife's arrival on March 13, but was spotted proudly pushing her pram - a Mamas and Papas Mylo - near her home.
Accompanied by her mum Anne, the 30-year-old singer looked trim and toned in an above-the-knee red printed summer dress, a messy up-do and trendy Aviator glasses.
She later Tweeted that she had enjoyed the 'incredible' sunshine on her walk, and that baby Aoife Belle had been loving it 'in the shade'.
Aoife is Una and rugby player fiance Ben Foden's first baby. She was born a week early weighing in at a robust 7lbs 13oz. Proud Ben said at the time that 'Una and baby are both amazing and healthy. So proud of them both!'
Aw, do you have a newborn like Una?
Have you been enjoying those first strolls in this lovely spring weather?
More on Parentdish: Taking your newborn baby out
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