Personalized Hippo 1st Birthday Women's T-Shirt. Hippo 1st Birthday! I mean Happy 1st Birthday! A cute, smiling hippo wearing a birthday hat sits in front of a birthday cake ready to blow out the candle. Cute first birthday gift for the one year old! Classic ladies' styling with a feminine neckline, sleeves and fit. 5.0 oz., pre-shrunk 100% cotton. Double-needle stitching throughout