A rare but severe complication can lead to the placenta been faulty attached to the uterus. This can lead to significant bleeding and a difficult delivery for mum and baby. A pathologically attached placenta to the uterus does not increase the risk for a small baby.

Reference: Jauniaux E, Dimitrova I, Kenyon N, Mhallem M, Kametas NA, Zosmer N, Hubinont C, Nicolaides KH, Collins SL. Impact of placenta previa with placenta accreta spectrum disorder on fetal growth. Ultrasound in Obstetrics & Gynecology. 2019 Nov;54(5):643-9.