Slightly. Two adults and an infant produce roughly 130 gal/day; the same household with a toddler doubles it. Pump frequency may increase to every 2-3 years until laundry volume drops back.
More detail
Wastewater volume during the early-childhood years scales mostly with laundry. Cloth-diaper households add 200-400 gallons per week of wash water. Disposable-diaper households see a smaller increase but still significant from extra everyday laundry, post-feeding cleanup, and frequent baths. Total daily wastewater for a household of 2 adults plus an infant is typically 130-180 gallons; with a toddler it climbs to 200-280 gallons; with two young children it reaches 300+ gallons. The 1,000-gallon tank that comfortably handled the pre-children household at a 4-year pump cadence may need 2-3 year cadence during the toddler years. Schedule a pump 6-12 months earlier than the previous cycle when the second child arrives, then resume the standard cadence as children age out of the high-laundry years. Cincinnati cloth-diaper-vs-disposable septic impact: cloth-diaper households add roughly 250-350 gallons per week of additional laundry water; disposable-diaper households add 50-100 gallons per week. The difference is meaningful for septic load. Cloth-diaper households planning long-term use should expect to pump every 18-24 months during the active diaper years; disposable-diaper households can typically maintain a 30-36 month cadence.