Translate the following English sentence to French:
"Firstly, because this is too late: risks from radiation, chemically-charged atmospheres and poor working posture are well known now and all have harmful consequences for the health of the woman and her baby, particularly in the first few weeks."
Premièrement, parce que c'est trop tard : les risques de radiation, des milieux chimiques et des positions imparfaites produisent leurs conséquences néfastes pour la santé de la femme et du ftus au cours des premières semaines.