What do systematic reviews say?

UCM vs ECC

UCM showed no clear difference in chronic lung disease (CLD) ‐ oxygen supplement at 36 weeks… compared with ECC (low certainty).

• Effect of timing of umbilical cord clamping and other strategies to influence placental transfusion at preterm birth… 2019 · Cochrane Headline outcomes only
  RR 1.03 [0.64, 1.66]
  7 studies · 682 participants
  Low