Sleeping and feeding

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Hello mommies ! My baby is six weeks old and sometimes she sleeps 4 hours straight - especially at night sometimes 5-6 hours straight. Meaning she sometimes has her last feeding 6 or 7 hours earlier. Should I wake her for a feeding or let her sleep ? She’s been gaining a steady weight (6.8 pounds at birth and 9.8 pounds now). I am exclusively breastfeeding

Thanks !