The girls are 2 months and 1 week old. During the day, they sleep well...

You've mixed up day and night. Gradually change the routine. Wake the child up during the day. Plus, introduce rituals before bedtime. For us, it's bathing, white noise, darkness.

Try the following recommendations to help your children get back to a normal sleep routine: 1. Create a cozy and calm environment in the room where the children sleep. Try to establish a bedtime ritual to help the children calm down and prepare for sleep. 2. Try to set a strict sleep schedule for the children. Put them to bed at the same time every evening, even if they do not want to sleep. 3. Avoid daytime naps. Let the children sleep only at night so that they can fall asleep better and sleep longer. 4. Spend time outdoors and physically engage the children so they are tired by the evening. 5. Avoid the use of screens (phones, tablets, televisions) before bedtime, as this can interfere with falling asleep. 6. If sleep problems persist, consult a pediatrician or sleep specialist for additional help and advice.