To find out how many days it will take for the baby elephant to weigh 225 pounds, we start with its initial weight and how much it gains daily.
- The initial weight of the baby elephant at birth is 150 pounds.
- It gains 2 pounds per day.
Now, we want to determine how many pounds the elephant needs to gain to reach 225 pounds:
\[ \text{Weight needed to gain} = 225 - 150 = 75 \text{ pounds} \]
Next, we calculate how many days it will take to gain 75 pounds at a rate of 2 pounds per day:
\[ \text{Number of days} = \frac{75 \text{ pounds}}{2 \text{ pounds per day}} = 37.5 \text{ days} \]
Since the number of days must be a whole number, we take the ceiling of 37.5, which means it will take 38 days for the elephant to reach or exceed the weight of 225 pounds.
Thus, the answer is:
\[ \boxed{38} \text{ days} \]
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