What do systematic reviews say?

Probiotics vs placebo

Probiotic showed no clear difference in large‐for‐gestational age > 90 centile compared with placebo (low certainty).

• Probiotic treatment for women with gestational diabetes to improve maternal and infant health and well‐being 2020 · Cochrane Headline outcomes only
  RR 0.73 [0.35, 1.52]
  2 studies · 174 participants
  Low